tory sold 50 balloons for school spirit day. he raised $37.50. he wrote this equation to show how much he charged for each balloon.

= 37.50

what mistake did tory make in writing his equation? what is a correct equation and its solution?
a. he divided b by 50 instead of by 37.50. a correct equation is = 50. its solution is $1,875.
b. he divided b by 50 instead of dividing 50 by b. a correct equation is = 37.50. its solution is $1.33.
c. he divided b by 50 instead of multiplying b by 50.a correct equation is 50b = 37.50. its solution is $0.75.
d. he divided b by 50 instead of setting up a proportion. a correct equation is = . its solution is $1,875.