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How to Calculate Present Value i Saved Help Compute the future value of a $100 investment for the following combinations of rates and times. a. r= 7.8%, t = 10 years b. r= 7.8%, t = 20 years c. r= 5.8%, t= 10 years d. r=5.8%, t= 20 years (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places.) a. Future value b. Future value C. Future value d. Future value