Andrea plans to make 20 annual deposits of 100 each into a fund in order to accumulate a target amount of K on the date of the last deposit. If the fund were to earn 5% effective per annum, the accumulated value on the date of the 20th deposit would be equal to her target amount of K. Andrea makes the first 5 deposits of 100. However, the fund earns only 4% effective up to this point. Andrea determines that she would have to increase the amount of the last 15 deposits to X in order to accumulate to the original target of K, assuming that the fund continues to earn only 4% effective. Determine X. a. 108 b. 124 C. 135 d. 116 o d e. 111