T= total money raised
c= # cookies sold
b= # brownies sold
Total money earned equals the price per cookie times number of cookies sold plus the price per brownie times the number of brownies sold.
T= ($0.50 * # c) + ($0.75 * # b)
T= $0.50c + $0.75b
ANSWER: The expression showing money earned is T= $0.50c + $0.75b
Hope this helps! :)