24% of the books on david's shelf are mysteries. there are 36 mysteries on the shelf. choose the expressions that complete each step involved in setting up and solving the proportion that represents the situation.

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50