Compute the future value of a $100 annual annuity for the same combination of rates and time periods as in problem 1. (Round your answers to the nearest cent. Round FVA factors to 4 decimal places.) a. r= 8%, t= 10 years FV of annuity $ 1.448.66 b. r= 8%, t= 20 years FV of annuity $ 4,576.20 c. r= 4%, t= 10 years FV of annuity $ d. r=4%, t = 20 years FV of annuity $