Question 21 (6 points) Sally, your grandmother lent you $9,000 to pay for this semester's tuition two months ago You agreed to pay her back at a rate of 4.25%, simple interest. An opportunity comes up to study abroad next semester. Your grandmother agrees to loan you an extra $7,000 today, but she insists that you repay her in 3 equal instalments, every 3 months starting 6 months from today. Using 12 months from today as a focal date, compute the amount of each payment. -2 15