How long will it take $300 to double if it earns the following rates? Compounding occurs once a year. Round your answers to two decimal places. a. 8%. year(s) b. 15%. year(s) c. 21% year(s) d. 100%. year(s) ind the future values of these ordinary annuities. Compounding occurs once a year. Do not round intermediate calculations. Round your answers to the learest cent. a. $300 per year for 10 years at 4%. $ b. $150 per year for 5 years at 2%. s c. $600 per year for 5 years at 0%. d. Rework parts a,b, and cassuming they are annuities due. Future value of $300 per year for 10 years at 4%:$ Future value of $150 per year for 5 years at 2%:5 Future value of 3600 per year for 5 years at 0% : 5