Please answer all questions.

28. How long will it take to triple your savings if you earn 6.4 percent interest, A. 11.89 years compounded annually B. 12.02 years C. 15.39 years D. 17.71 years E. 19.58 years 29. Isaac only has SI,090 today but needs $1.979 to buy a new computer. How long will he have to wait to buy the computer if he earns 5.4 percent compounded annually on his savings? Assume the price ofthe computer remains constant. A. 11.83 years B. 11.48 years C. 12-51 years D. 12.77 years E. 11.34 years 30. You have $500 today and want to triple your money in 6 years. What interest rate must you earn if the interest is compounded annually? A. 18.08 percent B. 19.90 percent C. 2.15 percent D. 20.09 percent E. 21.21 percent