Tim had 2b books for sale at a price of k dollars each. if y is the number of books he did not sell, which of the following represents the total dollar amount he received in sales from the books?

a. k(2b-y)
b. k(y-2b)
c. ky - 2b
d. 2b - ky
e. 2bk - y

For this case we have:

: Variable that represents the amount of books Tim had.

k: Variable that represents the price of each book

y: Variable that represents the quantity of books not sold.

Then we have, according to the statement that, the quantity of books sold is given by:

Thus, the total dollar amount received for the books sold are:

Option A