Solve the Problem. -The Sales of a Mature Product (One Which Has Passed

Multiple Choice

Solve the problem.
-The sales of a mature product (one which has passed its peak) will decline according to the function S(t) = S0e-at, where t is time in years since the peak sales. Find the sales of a product 21
Years after its peak sales if a = 0.15 and S0 = 28,100.

A) 32,648 units
B) 602 units
C) 1204 units
D) 761,865 units