Answer:
Step-by-step explanation:
It doesn't specify the interest rate/ growth per year so I guess we can assume 6%
Your teacher wants you to use online calculators like this one: https://www.calculator.net/finance-calculator.html
*To use it set it to PMT mode, set n as (65-age)*12, I/Y as 6, PV=0, press additional settings and change P/Y and C/Y to 12*
Let's say that we want to retire by 65
If you start saving at 25: 502
If you start saving at 30: 702
If you start saving at 35: 996