Exhilaration Snow Shop sells gloves for $50 each. Exhilaration pays $30 for the glove to the manufacturer and pays the sales clerk 10% (of the sales price) as a commission. Exhilaration has $3,000 of monthly fixed costs as well. How much sales in dollars does Exhilaration need to make in order to make $2,400 profit this month?
a. $360
b. $10,000
c. $20,000
d. $18,000