Your Monthly Sales of Tofu Ice Cream Are Falling at an Instantaneous

Multiple Choice

Your monthly sales of Tofu Ice Cream are falling at an instantaneous rate of 3% per month. If you currently sell $s = 1,070$ per month, solve the differential equation that describes your change in sales to predict your monthly sales. Assume that the current sales are given for time $t = 0$ .
NOTE: Enter your answer in the form $s = f ( t )$ , where f is some function of t.

A) $s = 1,070 + 0.03 t$
B) $s = 1,070 + t ^ { 0.03 }$
C) $s = 1,070 + t ^ { - 0.03 }$
D) $s = 1,070 e ^ { 0.03 t }$
E) $s = 1,070 e ^ { - 0.03 t }$