Josh has $500 in his savings account. He deposits $25 into his savings account each month. He purchased home theater equipment for $1,600. The store he bought the equipment from offered him a $1,600 interest-free loan for 24 months. He pays off $80 of the loan every month from his checking account (not his savings account). How many months will it take for Josh to have enough money in his savings account to pay off the entire outstanding amount for his purchase? Round your answer to the nearest whole number.