diff --git a/Work/bounce.py b/Work/bounce.py
index 3660ddd82..18bda0e6d 100644
--- a/Work/bounce.py
+++ b/Work/bounce.py
@@ -1,3 +1,11 @@
 # bounce.py
 #
 # Exercise 1.5
+height = 100  # metres
+num_bounces = 10
+i = 1
+
+while i <= num_bounces:
+    height = height * 3/5
+    print(i, round(height, 4))
+    i = i + 1
diff --git a/Work/hello.py b/Work/hello.py
new file mode 100644
index 000000000..75d9766db
--- /dev/null
+++ b/Work/hello.py
@@ -0,0 +1 @@
+print('hello world')
diff --git a/Work/mortgage.py b/Work/mortgage.py
index d527314e3..18da0157a 100644
--- a/Work/mortgage.py
+++ b/Work/mortgage.py
@@ -1,3 +1,35 @@
 # mortgage.py
 #
 # Exercise 1.7
+
+principal = 500000.0
+rate = 0.05
+payment = 2684.11
+total_paid = 0.0
+
+extra_payment_start_month = int(input('extra_payment_start_month: '))
+extra_payment_end_month = int(input('extra_payment_end_month: '))
+extra_payment = int(input('extra_payment: '))
+
+current_month = 1
+num_required_months = 0
+
+while principal > 0:
+    if  current_month >= extra_payment_start_month and current_month <= extra_payment_end_month:
+        principal = principal * (1 + rate/12) - payment - extra_payment
+        total_paid = total_paid + payment + extra_payment
+        remaining_principal = principal if principal > 0 else 0
+        print(f'{current_month}, {total_paid:0.2f}, {remaining_principal:0.2f}')
+    else:     
+        principal = principal * (1 + rate/12) - payment
+        total_paid = total_paid + payment
+        remaining_principal = principal if principal > 0 else 0
+        print(f'{current_month}, {total_paid:0.2f}, {remaining_principal:0.2f}')
+
+    current_month = current_month + 1    
+    num_required_months = num_required_months + 1
+
+print(f'Total paid: {total_paid:0.2f}')
+print(f'No. of months required to pay the mortgage: {num_required_months}')
+
+
diff --git a/Work/sears.py b/Work/sears.py
new file mode 100644
index 000000000..8d834173c
--- /dev/null
+++ b/Work/sears.py
@@ -0,0 +1,16 @@
+bill_thickness = 0.11 * 0.001  # metres (0.11 mm)
+sears_height = 442  # height (metres)
+
+day = 1
+num_bills = 1
+bills_height = 0.11
+
+while bills_height < sears_height:
+    print(day, num_bills, bills_height)
+    day = day + 1
+    num_bills = 2 * num_bills
+    bills_height = num_bills * bill_thickness
+
+print('No. of days:', day) 
+print('No. of bills:', num_bills)
+print('Final bills height:', bills_height)