John wants to buy a pair of shoes that has a price of $500. John decides to start saving after his birthday. John makes an initial deposit of $25 to his savings account
to pay for the shoes and then will save for the shoes in equal payments for X amount
of months. After the initial deposit, John saves at a rate of $20 each month.
If the output is the total amount that John needs to buy the shoes and X is the
months that John is saving for the shoes EXPLAIN how you would find out how
many months it will take John to save for the shoes for the given situation.