[Tutor] JES question concerning syntax

[Siobhan Wojcik]

Hello,

I've been having an issue with a program that I'm writing. The program
works until it has to compute something:

def carPmt():
  cost = requestInteger("How much does the car cost?")
  downPmt = requestInteger("If there is a down payment, how much?")
  tradeIn = requestInteger("If there is a trade-in, what is its value?")
  years = requestInteger("How many years will you be paying?")
  air = requestInteger("What is the interest rate?")

  payment = calculatePayment(cost,downPmt,tradeIn,years,air)
  print "With a down payment of",downPmt," a trade-in value of",tradeIn,
  print ", an annual interest rate of",air,", your new",cost, "car will
cost",
  print "you only",payment, "per month."

def calculatePayment(cost,downPmt,tradeIn,years,air):
  carCostInitial = cost - downPmt
  carCostIntermediate = carCostInitial - tradeIn
  monIntRate = air/12
  compoundingFactor = (1.0+monIntRate)**12.0/(1+monIntRate**12.0)-1.0
  monthPmt = monIntRate*carCostIntermediate*compoundingFactor
  return monthPmt



The first two sections work; the third one does not. When inputting random
values, I get this: "With a down payment of 5000 ,a trade-in value of 7000
,an annual interest rate of 2 ,your new 25000 car will cost you only 0.0
per month" Obviously I don't want my answer to be 0.0. I've had other
people look at it (although they aren't well-versed in Python) and they
couldn't help me isolate the problem.

Thanks a million.

Siobhan Wojcik
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