For an investment to triple in value during a 16-year period, a. What annually compounded rate of return must it earn? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Annually compounded rate of return 1% b. What quarterly compounded rate of return must it earn? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Quarterly compounded rate of return % c. What monthly compounded rate of return must it earn? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Monthly compounded rate of return