def P(p_0, t, i):
return p_0 * (1+i)**t

when i call the fuction P(1000,7,5) it returns it as 1000 and any otha number i put as p_0 it returns that number and i cant figure out why

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hm, I tried this on the python console

>>> def P(p_0, t, i):
...  return p_0 *(1+i) ** t
...
>>> P(10000, 5, 7)
327680000
>>> P(10000, 7, 5)
2799360000L
>>>

so I can't see your problem ?

It also works for me, but maybe try

def P(p_0, t, i):
  return (p_0 * (1+i)**t)

or

def P(p_0, t, i):
 a= p_0 * (1+i)**t
 return a

And see if that fixes it for you.
(also could check your version of Python and get one of the newer ones if it's old)

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