You purchase a car using a $20,000 loan with a 5% simple interest rate.(a) suppose you pay the loan off after 4 years. how much interest do you pay on your loan? show your work. (6 points, 3 for answer, 3 for work)(b) suppose you pay the loan off after 2 years. how much interest do you save by paying the loan off sooner? show your work. (6 points, 3 for answer, 3 for work)