diff --git a/Work/bounce.py b/Work/bounce.py
index 3660ddd82..429a9ae4d 100644
--- a/Work/bounce.py
+++ b/Work/bounce.py
@@ -1,3 +1,10 @@
 # bounce.py
 #
 # Exercise 1.5
+height = 100
+i=1
+while i < 10:
+	height = height * 0.6
+	i = i+1
+	print(i, height)
+
diff --git a/Work/hello.py b/Work/hello.py
new file mode 100644
index 000000000..ad35e5ae3
--- /dev/null
+++ b/Work/hello.py
@@ -0,0 +1 @@
+print("Hello World")
diff --git a/Work/mortgage.py b/Work/mortgage.py
index d527314e3..e9d07e237 100644
--- a/Work/mortgage.py
+++ b/Work/mortgage.py
@@ -1,3 +1,32 @@
 # mortgage.py
 #
 # Exercise 1.7
+
+
+principal = 500000.0
+rate = 0.05
+payment = 2684.11
+total_paid = 0.0
+month = 0.0
+
+#User-defined extra payment variables
+extra_payment_start_month=61    # Extra payments start after 5 years (month 61)
+extra_payment_end_month = 108   # Extra payments end after 4 years (month 108)
+extra_payment = 1000			# Extra payment amount
+while principal > 0:
+	# Chack if the current month is within the extra payment period
+	if extra_payment_start_month <= month < extra_payment_end_month:
+		monthly_payment = extra_payment + payment
+	else:
+		monthly_payment = payment
+	# Apply monthly interest and substract the payment
+	principal = principal * (1+rate/12) - payment
+	total_paid += monthly_payment
+	month +=1
+	# Final adjustment if the principal goes negative
+	if principal < 0:
+		total_paid = total_paid + principal # Adjust the last payment
+		principal = 0 # Set principal to 0 to exit the loop
+	print(f'Month: {month} vs   {total_paid}')
+	
+
diff --git a/Work/pcost.py b/Work/pcost.py
index e68aa20b4..f0821097d 100644
--- a/Work/pcost.py
+++ b/Work/pcost.py
@@ -1,3 +1,21 @@
 # pcost.py
 #
 # Exercise 1.27
+import csv
+each_share = 0.0
+shares = 0.0
+prices = 0.0
+total_cost = 0
+with open('/Users/doston_ra/practical-python/Work/Data/portfolio.csv', 'rt') as file:
+    reader = csv.reader(file)
+    next(reader)
+    for line in reader: 
+
+        shares=  float(line[1])
+        prices = float(line[2])
+        each_share = shares * prices
+        total_cost += each_share
+
+print('Total cost is ', total_cost)
+
+    
diff --git a/Work/sears.py b/Work/sears.py
new file mode 100644
index 000000000..681239f2b
--- /dev/null
+++ b/Work/sears.py
@@ -0,0 +1,15 @@
+
+bill_thickness = 0.11 * 0.001 # Meters
+sears_height = 442 # height meters
+day = 1
+num_bills = 1
+
+while bill_thickness * num_bills < sears_height: 
+	print(day, num_bills, num_bills * bill_thickness)
+	day = day + 1
+	num_bills = num_bills * 2
+
+print('Number of days', day)
+print('Number of bills', num_bills)
+print('Final height', num_bills * bill_thickness)
+