A finance company will lend you $1000 for a finance charge of $20 plus simple interest at 1% per month. This mean you will pay 1% of $1000, or $10 per month plus the $20 finance charge. Find a formula for F if F is the finance charge and M is the number of months before you repay the loan.

Isn't F already given as $20? How am I suppose to do this!?