SAT Mathematics Practice Test 2

Since the musician earns $0.09$ for each download, the musician earns $0.09\mathit{d}$ dollars when the song is downloaded d times.Similarly, since the musician earns 0.002 each time the song is streamed, the musician earns $0.002\mathit{s}$ dollars when the song is streamed s times. Therefore, the musician earns a total of $0.09\mathit{d}+0.002\mathit{s}$ dollars when the song is downloaded $\mathit{d}$ times and streamed $\mathit{s}$ times.
Choice A is incorrect because the earnings for each download and the earnings for time streamed are interchanged in the expression. Choices B and D are incorrect because in both answer choices, the musician will lose money when a song is either downloaded or streamed. However, the musician only earns money, not loses money, when the song is downloaded or streamed.