Given the accumulation function a (t), which of the following formulas gives the accumulated value at time 4 of four deposits of 10 made at times 1, 2, 3, 4.
A 10 a (4)/ a (1) + a (4) / a (2) a + (4) a / (3) +1
B 10 [a (3) +a (2) + a (1) + 1]
C 10 [a (1) +a (2) +a (3) +a (4)]
D 10 1 / a (1) + 1/ a (2) + 1 / a (3) + 1 / a (4)
E 10a (4)