Four friends do yardwork for their neighbors over the weekend

Four friends do yardwork for their neighbors over the weekend

Four friends do yardwork for their neighbors over the weekend, earning $15, $20, $25, and $40, respectively. They decide to split their earnings equally among themselves. In total how much will the friend who earned $40 give to the others?

(A) $5 (B) $10 (C) $15 (D) $20 (E) $25

answer：C