The owner of a hobby store bought a case of 9-volt batteries for $47.80. He marked the price up such that his profit was $3.55 per battery. Once he had sold 12 batteries, the store owner had recovered his cost. how many 9-volt batteries are in a case?
Select one:
a. 120 batteries
b. 105 batteries
c. 110 batteries
d. 115 batteries

Question

The owner of a hobby store bought a case of 9-volt batteries for $47.80. He marked the price up such that his profit was $3.55 per battery. Once he had sold 12 batteries, the store owner had recovered his cost. how many 9-volt batteries are in a case?
Select one:
a. 120 batteries
b. 105 batteries
c. 110 batteries
d. 115 batteries

anonymous · Answer

x = price he paid for a battery

equations are:

12(x + 3.55) = 47.80  --- [after 12 he recovered cost/broke even]

solve for x.

the number of batteries is 47.80/x

anonymous · Answer

let me know if you have questions ^_^

anonymous · Answer

i still dont understand @Euler271