QUESTION 7 Solve the problem. If $4000 earned simple interest of $149.33 in 7 months, what was the simple interest rate? O 6.4% 8.4% O 7.4% O 5.4% QUESTION 8 Use I = Prt for simple interest to find the indicated quantity. I = $750; r = 6%; t = 6 months. Find P. $25,000 $22.50 $24,250 $25,750 QUESTION 9 Use I = Prt for simple interest to find the indicated quantity. P = $13,500; t = 4 months; I = $517.50. Find r. O 7.7% 11.7% 11.5% O 3.8%