diff --git a/Solutions/Module4MortgageCalculatorChallengeSolution.py b/Solutions/Module4MortgageCalculatorChallengeSolution.py
index ddb9c28..d069481 100644
--- a/Solutions/Module4MortgageCalculatorChallengeSolution.py
+++ b/Solutions/Module4MortgageCalculatorChallengeSolution.py
@@ -14,14 +14,14 @@
 #Convert the strings into floating numbers so we can use them in teh formula
 loanDurationInYears = float(strLoanDurationInYears)
 loanAmount = float(strLoanAmount)
-interestRate = float(strInterestRate)
+interestRate = float(strInterestRate)/12
 
 #Since payments are once per month, number of payments is number of years for the loan * 12
 numberOfPayments = loanDurationInYears*12
 
 #Calculate the monthly payment based on the formula
-monthlyPayment = loanAmount * interestRate * (1+ interestRate) * numberOfPayments \
-    / ((1 + interestRate) * numberOfPayments -1)
+monthlyPayment = loanAmount * interestRate * (1 + interestRate)** numberOfPayments \
+/((1 + interestRate) ** numberOfPayments - 1)
 
 #provide the result to the user
 print("Your monthly payment will be " + str(monthlyPayment))