Bill is considering investing $450 at the end of every month in a fixed income instrument. He will receive $27,000 at the end of four years. If interest is compounded monthly, what is the effective annual rate of return earned on the investment?
a. 13.6%
b. 22.3%
c. 11.6%
d. 15.1%
e. 11.1%

Mr. beautiful, an organization that sells weight training sets, has an ordering cost of $40 for the bb-1 set. (bb-1 stands for body beautiful number 1.) the carrying cost for bb-1 is $5 per set per year. to meet demand, mr. beautiful orders large quantities of bb-1 seven times a year. the stockout cost for bb-1 is estimated to be $50 per set. over the past several years, mr. beautiful has observed the following demand during the lead time for bb-1: demand during lead time probability40 0.150 0.260 0.270 0.280 0.290 0.1total 1.0the reorder point for bb-1 is 60 sets. what level of safety stock should be maintained for bb-1?