Yen, Raeann and Shannon each sold an equal number of scones. Yen collected a total of $50.40 from selling 8 mocha scones and some vanilla scones. Raeann collected a total of $57.20 from selling 12 mocha scones and some vanilla scones. How much did Shannon collect if she sold only vanilla scones?
Raeann collected more money than Yen from the sale of the scones but the number of scones sold by each girl was the same. This shows that each mocha muffin is higher priced than each vanilla muffin. 

Amount that Raeann collected more than Yen
= 57.20 - 50.40
= $6.80

Number of more mocha scones that Raeann sold
= 12 - 8
= 4

Extra amount collected from the sale of each mocha muffin
= 6.80 ÷ 4
= $1.70

Total extra amount collected from the sale of 8 mocha scones
= 8 x 1.70
= $13.60

If Yen sold only vanilla scones, she would collect $13.60 less than her original amount.

Amount that Shannon collected if she sold only vanilla scones
= 50.40 - 13.60
= $36.80

Answer(s): $36.80