The Annual Sales Y (In Millions of Dollars) of a Company

Multiple Choice

The annual sales y (in millions of dollars) of a company satisfy the differential equation $\frac { d y } { d t } = 0.2 y ; \quad y ( 0 ) = 2$ . Which of the following is a verbal description of the rate of change of annual sales ?

A) The annual sales are increasing at a rate proportional to the annual sales.
B) The annual sales are increasing at $0.2 million ($200,000) per year.
C) The annual sales are decreasing at a rate proportional to the annual sales.
D) The annual sales are increasing at a rate proportional to $0.2 million ($200,000) per year.