(1 point) Problem 8 - Annuities in Arithmetic Progression At an annual effective rate of interest i = 5%, find the AV of the following decreasing 21-year annuities-immediate with annual payments as follows: a) First payment is 21, and each payment thereafter decreases by 1. AV1 = 455.72 b) First payment is 84, and each payment thereafter decreases by 4. AV2 = 598.59 c) First payment is 41, and each payment thereafter decreases by 1. AV3 = d) First payment is 146, and each payment thereafter decreases by 6. AV4 = (1 point) Problem 8 - Annuities in Arithmetic Progression At an annual effective rate of interest i = 5%, find the AV of the following decreasing 21-year annuities-immediate with annual payments as follows: a) First payment is 21, and each payment thereafter decreases by 1. AV1 = 455.72 b) First payment is 84, and each payment thereafter decreases by 4. AV2 = 598.59 c) First payment is 41, and each payment thereafter decreases by 1. AV3 = d) First payment is 146, and each payment thereafter decreases by 6. AV4 =