diff --git a/Work/bounce.py b/Work/bounce.py
index 3660ddd82..190d5d80b 100644
--- a/Work/bounce.py
+++ b/Work/bounce.py
@@ -1,3 +1,8 @@
 # bounce.py
 #
 # Exercise 1.5
+height = 100
+
+for i in range(10):
+    height = height * 3 / 5
+    print(i+1, round(height,4))
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diff --git a/Work/mortgage.py b/Work/mortgage.py
index d527314e3..5387f99e4 100644
--- a/Work/mortgage.py
+++ b/Work/mortgage.py
@@ -1,3 +1,23 @@
 # mortgage.py
-#
-# Exercise 1.7
+
+principal = 500000.0
+rate = 0.05
+payment = 2684.11
+total_paid = 0.0
+extra_payment_start_month = 60
+extra_payment_end_month = 108
+extra_payment = 1000
+month = 0
+
+while principal > 0:
+    month = month + 1
+    if month >= extra_payment_start_month and month <= extra_payment_end_month:
+        month_payment = payment + extra_payment
+    else:
+        month_payment = payment
+    month_payment = min(month_payment, principal * (1 + rate / 12))
+    principal = principal * (1+rate/12) - month_payment
+    total_paid = total_paid + month_payment
+    print(f"{month:10d} {total_paid:10.2f} {principal:10.2f}")
+
+print(f'Total paid {total_paid:10.2f}\nMonths {month}')
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diff --git a/Work/pcost.py b/Work/pcost.py
index e68aa20b4..abc2caa27 100644
--- a/Work/pcost.py
+++ b/Work/pcost.py
@@ -1,3 +1,26 @@
 # pcost.py
 #
 # Exercise 1.27
+import csv
+import sys
+
+def portfolio_cost(filename):
+    cost = 0
+    with open(filename, "rt") as f:
+        reader = csv.reader(f)
+        headers = next(reader) # skip headers
+        for ticker, nshares, share_cost in reader:
+            try:
+                cost += int(nshares) * float(share_cost)
+            except ValueError:
+                print(f"Invalid entries found nshares: {nshares}, share_cost: {share_cost}")
+
+    return cost
+
+if len(sys.argv) == 2:
+    filename = sys.argv[1]
+else:
+    filename = "Data/portfolio.csv"
+
+cost = portfolio_cost(filename)
+print(f"Total cost: {cost}")
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diff --git a/Work/report.py b/Work/report.py
index 47d5da7b1..a886a7ef3 100644
--- a/Work/report.py
+++ b/Work/report.py
@@ -1,3 +1,45 @@
 # report.py
 #
 # Exercise 2.4
+import csv
+
+def read_portfolio(filename):
+    
+    portfolio = []
+
+    with open(filename, 'rt') as f:
+        reader = csv.reader(f)
+        headers = next(reader)
+        for ticker, nshares, share_price in reader:
+            nshares = int(nshares)
+            share_price = float(share_price)
+            portfolio.append({"name": ticker, "shares": nshares, "price": share_price})
+    
+    return portfolio
+
+def read_prices(filename):
+
+    prices = {}
+    with open(filename, 'rt') as f:
+        reader = csv.reader(f)
+        for row in reader:
+            try:
+                ticker, price = row
+                price = float(price)
+                prices[ticker] = price
+            except ValueError as e:
+                print(f"Skipping row: {row}, error: {e}")
+    return prices
+
+portfolio = read_portfolio("Data/portfolio.csv")
+prices = read_prices("Data/prices.csv")
+
+portfolio_cost = 0
+portfolio_value = 0
+for stock in portfolio:
+    portfolio_cost += stock['shares'] * stock['price']
+    portfolio_value += stock['shares'] * prices[stock['name']]
+
+print(f"Total cost: {portfolio_cost}")
+print(f"Total value: {portfolio_value}")
+print(f"Net gain/loss: {portfolio_value - portfolio_cost}")
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diff --git a/Work/sears.py b/Work/sears.py
new file mode 100644
index 000000000..8add59254
--- /dev/null
+++ b/Work/sears.py
@@ -0,0 +1,15 @@
+# sears.py
+
+bill_thickness = 0.11 * 0.001    # Meters (0.11 mm)
+sears_height   = 442             # Height (meters)
+num_bills      = 1
+day            = 1
+
+while num_bills * bill_thickness < 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)
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