Compute the future value of a $100 investment for the following combinations of rates and times. a. r= 6.6%, t= 10 years b. r= 6.6%, t= 20 years c. r= 4.6%, t= 10 years d. r= 4.6%, t= 20 years (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places.) a. Future value Future value Future value d. Future value