GMAT Problem Solving (PS) | Re: The yearly compensation of salesperson Y is $4,000 plus 8 percent of

The yearly compensation of salesperson Y is $4,000 plus 8 percent of the amount by which the total value of the items sold by the store exceeds $250,000. The yearly compensation of salesperson Z is 12 percent of the amount by which the total value of the items sold by the store exceeds $300,000. In the previous year, both salesperson Y and salesperson Z had the same compensation. What was the yearly compensation of salesperson Y last year?

A) $18,000
B) $21,000
C) $24,000
D) $30,000
E) $50,000