Question

For $1.80 a grocer buys a case of fruit which contains 12 dozen. He knows that 2 dozen will spoil before he sells them. At what price per dozen must he sell the good ones to gain 1/3 of the whole cost?

Answer 1

I assume you mean she wants to make 50% profit, based on a cost of $1.80/dozen. (The wording is ambiguous. If the problem was presented as you posted it, it's from a pretty sloppy text.)

10x = 1.5(1.80*12)
x = 3.24

Answer 2

i didnt understand the awnser fully but if i did the awnser is 5 cents a donut

Explanation: