10. Dara's cost for a new wardrobe was $3420. She made a down payment of $860 and financed the balance on a 24-month fixed payment installment loan. The monthly payments are $111.73. Instead of making her 12 payment, Dara decides to pay the total remaining balance and terminate the loan. a) Determine the APR of the installment loan. b) How much interest will Dara save, computed by the actuarial method? c) What is the total amount due to pay off the loan