can someone help me with the formula to use with python

Question

Build a function retirement_age(PMT, i, FV, start_age) that calculates the (whole) age at which your customer can retire, if they:

invest an amount, PMT at the END of every YEAR (with the first payment made exactly one year from now),
at an interest rate of i% per year, compounded annually.
They require an amount of AT LEAST FV in order to be able to afford retirement.
They just turned start_age years old.

IMPORTANT:
Your function may not call any of the other functions you've defined in this project (i.e. you may not call savings_calculator(PMT, n, i) or retirement_savings(PMT, i, start_age, end_age) inside this function)

You can assume that start_age is a positive integer.

### START FUNCTION 3

def retirement_age(PMT, i, FV, start_age):

# YOUR CODE HERE

return int(age)

### END FUNCTION 3
IMPORTANT:
Your function needs to return an int value rounded to 2 decimal places.

If your answer is not rounded correctly to 2 decimal places, you will receive 0 for the question.

Make sure that the following tests all give a True result:

retirement_age(20000, 0.1, 635339.63, 20) == 35
retirement_age(10000, 0.1, 572749.99, 40) == 60

Answer 1

This seems like a homework assignment.
Please post what you've done so far and what exactly you're stuck on.