python

You want to save money for a trip to Europe. You decide to use a savings account with an annual interest rate.

Write a function called calc_years() that determines how long it will take (years) to reach a target balance given an initial balance and interest rate. You can calculate your updated balance after adding interest for each year using the following formula:

updated balance = current balance + current balance * interest rate

using this:

def calc_years(initial_balance, rate, target):

#calculation

return years