diff --git a/Work/bounce.py b/Work/bounce.py
index 3660ddd82..4bb8e296b 100644
--- a/Work/bounce.py
+++ b/Work/bounce.py
@@ -1,3 +1,14 @@
 # bounce.py
 #
 # Exercise 1.5
+# A rubber ball is dropped from a height of 100 meters and each time it hits the ground,
+# it bounces back up to 3/5 the height it fell.
+# Write a program bounce.py that prints a table showing the height of the first 10 bounces.
+height = 100
+constant = 3/5
+n = 1
+
+while n <= 10:
+    height *= constant
+    print(round(height, 4))
+    n += 1
diff --git a/Work/mortgage.py b/Work/mortgage.py
index d527314e3..c30f1d1c5 100644
--- a/Work/mortgage.py
+++ b/Work/mortgage.py
@@ -1,3 +1,20 @@
 # mortgage.py
 #
 # Exercise 1.7
+principal = 500000.0
+rate = 0.05
+payment = 2684.11
+total_paid = 0.0
+extra_payment = 1000
+month = 1
+while principal > 0:
+    if month <= 12:
+        special_payment = payment + extra_payment
+    else:
+        special_payment = payment
+    principal = principal * (1+rate/12) - special_payment
+    total_paid = total_paid + special_payment
+    month += 1
+
+print('Total paid', total_paid)
+print('Total month', month-1)
diff --git a/Work/mortgage19.py b/Work/mortgage19.py
new file mode 100644
index 000000000..ce9657973
--- /dev/null
+++ b/Work/mortgage19.py
@@ -0,0 +1,24 @@
+principal = 500000.0
+rate = 0.05
+payment = 2684.11
+total_paid = 0.0
+extra_payment = 1000
+month = 1
+extra_payment_start_month = 60
+extra_payment_end_month = 108
+extra_payment = 1000
+
+while principal > 0:
+    if extra_payment_start_month <= month <= extra_payment_end_month:
+        special_payment = payment + extra_payment
+    else:
+        special_payment = payment
+    if special_payment > principal:
+        special_payment = principal * (1+rate/12)
+    principal = principal * (1+rate/12) - special_payment
+    total_paid = total_paid + special_payment
+    print(month, total_paid, round(principal, 2))
+    month += 1
+
+print('Total paid', total_paid)
+print('Total month', month-1)
diff --git a/Work/notes.md b/Work/notes.md
new file mode 100644
index 000000000..199dd7030
--- /dev/null
+++ b/Work/notes.md
@@ -0,0 +1,47 @@
+## Integers (int)
+
+x + y      Add
+x - y      Subtract
+x * y      Multiply
+x / y      Divide (produces a float)
+x // y     Floor Divide (produces an integer)
+x % y      Modulo (remainder)
+x ** y     Power
+x << n     Bit shift left
+x >> n     Bit shift right
+x & y      Bit-wise AND
+x | y      Bit-wise OR
+x ^ y      Bit-wise XOR
+~x         Bit-wise NOT
+abs(x)     Absolute value
+
+## Float
+
+x + y      Add
+x - y      Subtract
+x * y      Multiply
+x / y      Divide
+x // y     Floor Divide
+x % y      Modulo
+x ** y     Power
+abs(x)     Absolute Value
+
+## Strings
+
+### Escape codes
+
+'\n'      Line feed
+'\r'      Carriage return
+'\t'      Tab
+'\''      Literal single quote
+'\"'      Literal double quote
+'\\'      Literal backslash
+
+### String Representation
+
+a = '\xf1'          # a = 'ñ'
+b = '\u2200'        # b = '∀'
+c = '\U0001D122'    # c = '𝄢'
+d = '\N{FOR ALL}'   # d = '∀'
+
+https://unicode.org/charts/
diff --git a/Work/pcost.py b/Work/pcost.py
index e68aa20b4..99df7e545 100644
--- a/Work/pcost.py
+++ b/Work/pcost.py
@@ -1,3 +1,21 @@
 # pcost.py
 #
 # Exercise 1.27
+import csv
+
+
+def portfolio_cost(filename):
+    f = open(filename, "rt")
+    rows = csv.reader(f)
+    headers = next(rows)
+    total = 0.0
+    for rowno, row in enumerate(rows):
+        try:
+            record = dict(zip(headers, row))
+            shares = int(record['shares'])
+            price = float(record['price'])
+            total += shares*price
+        except ValueError:
+            print(f'Row {rowno}: Bad row: {row}')
+    f.close()
+    return total
diff --git a/Work/pcost_function.py b/Work/pcost_function.py
new file mode 100644
index 000000000..9de9794b1
--- /dev/null
+++ b/Work/pcost_function.py
@@ -0,0 +1,19 @@
+# pcost.py
+#
+# Exercise 1.27
+
+import csv
+
+
+def portfolio_cost(filename):
+    try:
+        f = open(filename, "rt")
+        rows = csv.reader(f)
+        next(rows)
+        total = 0
+        for row in rows:
+            total += int(row[1])*float(row[2])
+        f.close()
+        return total
+    except Exception:
+        print("Couldn't parse", Exception)
diff --git a/Work/report.py b/Work/report.py
index 47d5da7b1..18439a914 100644
--- a/Work/report.py
+++ b/Work/report.py
@@ -1,3 +1,47 @@
 # report.py
 #
 # Exercise 2.4
+
+import csv
+
+
+def read_portfolio(filename):
+    try:
+        f = open(filename, 'rt')
+        rows = csv.reader(f)
+        headers = next(rows)
+        portfolio = []
+
+        for row in rows:
+            symbol = (row[0], int(row[1]), float(row[2]))
+            portfolio.append(symbol)
+    except:
+        print("Can't read file", filename)
+    return portfolio
+
+
+def read_prices(filename):
+    try:
+        f = open(filename, 'rt')
+        rows = csv.reader(f)
+        prices = []
+        for row in rows:
+            if len(row) > 0:
+                price = (row[0], float(row[1]))
+                prices.append(price)
+    except:
+        print("Can't read price file", filename)
+    return prices
+
+
+def make_report(portfolio, prices):
+    report = []
+    for price in prices:
+        print(price)
+        for share in portfolio:
+            print(share)
+            if price[0] == share[0]:
+                print(price[0])
+                change = share[2] - price[1]
+                report.append((share[0], share[1], share[2], change))
+    return report
diff --git a/Work/report_dict.py b/Work/report_dict.py
new file mode 100644
index 000000000..3fa34fc8c
--- /dev/null
+++ b/Work/report_dict.py
@@ -0,0 +1,36 @@
+
+def read_portfolio(filename):
+    try:
+        f = open(filename, 'rt')
+        rows = csv.reader(f)
+        headers = next(rows)
+        portfolio = []
+
+        for row in rows:
+            symbol = {headers[0]: row[0], headers[1]: int(row[1]), headers[2]: float(row[2])}
+            portfolio.append(symbol)
+    except:
+        print("Can't read file", filename)
+    return portfolio
+
+
+def read_prices(filename):
+    try:
+        f = open(filename, 'rt')
+        rows = csv.reader(f)
+        prices = []
+        for row in rows:
+            if len(row) > 0:
+                price = {'name': row[0], 'price': float(row[1])}
+                prices.append(price)
+    except:
+        print("Can't read price file", filename)
+    return prices
+
+
+def make_report(portfolio, prices):
+    for price in prices:
+        for share in portfolio:
+            if price['name'] == share['name']:
+                share['change'] = share['price'] - price['price']
+    return portfolio
diff --git a/Work/sears.py b/Work/sears.py
new file mode 100644
index 000000000..11bfa60e0
--- /dev/null
+++ b/Work/sears.py
@@ -0,0 +1,17 @@
+# One morning, you go out and place a dollar bill on the sidewalk by the Sears tower in Chicago.
+# Each day thereafter, you go out double the number of bills. How long does it take for the stack
+# of bills to exceed the height of the tower?
+
+bill_thickness = 0.11 * 0.001  # Meters (0.11 mm)
+sears_height = 442
+num_bills = 1
+day = 1
+
+while num_bills*bill_thickness < sears_height:
+    print(day, num_bills, num_bills*bill_thickness)
+    day += 1
+    num_bills *= 2
+
+print('Number of days', day)
+print('Number of bills', num_bills)
+print('Final height', num_bills * bill_thickness)