rbt wrote:

Is this mathematically correct?

def inflation():

start = int(str.strip(raw_input("How much money do you need each

month at the start of retirement: ")))

inflation = float(str.strip(raw_input("What will inflation average

over the next 30 years(.03, .04, etc): ")))

for x in xrange(30):

start = start*inflation+start

print start

inflation()

I'm not really familiar with financial calculations, but it looks

correct. There's a faster way though, since repeated multiplication is

the same as taking the power with the number of years as the exponent:

def inflation():

start = ... # same as before

inflation = ... # same as before

print start * (1+inflation)**30

--

If I have been able to see further, it was only because I stood

on the shoulders of giants. -- Isaac Newton

Roel Schroeven