Calculate the amount that must be invested at the end of each year at 9.1% compounded annually in order to accumulate $510,000 after: (Do not round intermediate calculations and round your final answers to 2 decimal places.) $ a. 30 years. b. 35 years. $ In each case, also determine what portion of the $510,000 represents earnings on the annual investments. (Round your intermediate calculations and final answers to 2 decimal places.) a. Earnings portion b. Earnings portion