Salvatore will contribute $600 to a mutual fund at the beginning of each calendar quarter. a. What will be the value of his mutual fund after 7 1/2 years if the fund earns 8.6% compounded annually? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Value of mutual fund $ b. How much of this amount represents investment earnings? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Investment earnings