Dana, Eva and Gillian each sold an equal number of macarons. Dana collected a total of $53.10 from selling 9 strawberry macarons and some chocolate macarons. Eva collected a total of $60.60 from selling 14 strawberry macarons and some chocolate macarons. How much did Gillian collect if she sold only chocolate macarons?
Eva collected more money than Dana from the sale of the macarons but the number of macarons sold by each girl was the same. This shows that each strawberry muffin is higher priced than each chocolate muffin. 

Amount that Eva collected more than Dana
= 60.60 - 53.10
= $7.50

Number of more strawberry macarons that Eva sold
= 14 - 9
= 5

Extra amount collected from the sale of each strawberry muffin
= 7.50 ÷ 5
= $1.50

Total extra amount collected from the sale of 9 strawberry macarons
= 9 x 1.50
= $13.50

If Dana sold only chocolate macarons, she would collect $13.50 less than her original amount.

Amount that Gillian collected if she sold only chocolate macarons
= 53.10 - 13.50
= $39.60

Answer(s): $39.60