a year.) Principal 27. $6000 Rate Time 4 3% 1 year 1 year In Exercises 2730, find the simple interest. (Assume 360 days in a year.) Principal Rate Time 27. $6000 3% 28. $8400 5% 6 years 29. $20,000 8% 9 months 30. $36,000 15% 60 days 31. In order to pay for tuition and books, a college student borrows $3500 for four months at 10.5% interest. a. How much interest must the student pay? b. Find the future value of the loan. In Exercises 32-34, use the formula for future value with simple interest to find the missing quantity. Round dollar amounts to the nearest cent and rates to the nearest tenth of a percent. 32. A = ?, P = $12,000, 8.2%, t = 9 months 33. A = $5750, P = $5000, r = ?, 1 = 2 years 34. A = $16,000, P = ?, r = 6.5%, t = 3 years 35. You plan to buy a $12,000 sailboat in four years. How much should you invest now, at 7.3% simple interest, to have enough for the boat in four years? (Round up to the nearest cent.) 36. You borrow $1500 from a friend and promise to pay back $1800 in six months. What simple interest rate will you pay