SAT Mathematics Practice Test 4

Let m be the number of movies Jill rented online during the month. Since the monthly membership fee is $\mathrm{\$}9.80$and there is an additional fee of $\mathrm{\$}1.50$ to rent each movie online, the total of the membership fee and the movie rental fees, in dollars, can be written as $9.80+1.50$ m. Since the total of these fees for the month was $\mathrm{\$}12.80$, the equation $9.80+1.50\mathit{m}=12.80$ must be true. Subtracting $9.80$ from each side and then dividing each side by $1.50$ yields $\mathit{m}=2.$
Choices A, C, and D are incorrect and may be the result of errors in setting up or solving the equation that represents the context.