Robert Altidore invested $6,200 at 9% annual interest, and left the money invested without withdrawing any of the interest for 9 years. At the end of the 9 years. Robert withdrew the accumulated amount of money. Click here to view the factor table. (For calculation purposes, use 5 decimal places as displayed in the factor table provided.) (a) What amount did Robert withdraw, assuming the investment earns simple interest? Accumulated amount $ (b) What amount did Robert withdraw, assuming the investment earns interest compounded annually? (Round answer to 2 decimal places, eg. 25.25) Accumulated amount $