Mrs. zabel, the yearbook adviser, always likes to sell a large amount of yearbooks because after the initial set-up costs are paid, the printing is not too expensive.

if the yearbook staff sells 50 yearbooks, the cost per yearbook is $45. if they sell 125 yearbooks, the cost per yearbook is $37.50.

assuming a linear equation fits the situation, find the price per yearbook if the staff sells 150 yearbooks.