HELP ME PLEASE I NEED THIS and tell me how to solve for it

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

How can you construct perpendicular lines and prove theorems about perpendicular lines