Question 7.16 Deposits of 250 are made into an account at the beginning of each 5-year period for 40 years. The account earns interest at an annual effective interest rate i. The accumulated amount at the end of 40 years is X, which is 4 times the accumulated amount in the account at the end of 20 years. Calculate X. A 6,327.63 B 8,327.63 C 22,418.72 D 35,418.72 E 37,418.75