APR Interest Calculator help

I'm taking an introductory course to python and I'm having really frustrating time as this is very simple and i have done programming much more complex and just getting really frustrated on being hung up on this.

So my assignment is to create a calculator that does APR interest using the formulahttp://research.cs.queensu.ca/home/c...1/Equation.JPG

Where A is the monthly payment, P is the total amount borrowed (the principal), n is the number of months for repayment and i is the monthly interest rate. You can calculate the monthly interest rate by dividing the annual interest rate ("APR") by 12.

For example, to borrow $30,000 (P) for a 10 year term (n = 120) with an APR interest rate of 6% (i = 0.06 / 12 = 0.005), A calculates to be $333.06 - the monthly payment. The total interest paid over 10 years (always depressing!) = 120 * $333.06 - $30,000 = $9,967.38.

Code:

`def main():`

print("****************************************")

print("Mortgage Calculator v1.0")

print("****************************************")

print("")

principal = float(input("Principal Amount "))

years = int(input("Input number of years "))

interest = float(input("Input interest percentage "))

interest = (interest/100)/12

months = years*12

monthly_payments = principal*interest/1-(1+interest)**-months

print(apr)

print("After", Years, "years at", format(interest, '.0%'), " interest ", "total is", format(Total, '.2f'))

print("Monthly payments will be", monthly_payments)

print("Total interest will amount to", format(total_interest, '.2f'))

main()