it costs a publishing company 50000 dollars to make books . the 50000 is a fixed cost or a cost that can not change . to help the publishing company sell the books , a marketing company charges 4 dollars for each book sold . if the company charges 9 dollars per book , how many books should they sell to break even ? Select:
A) 100
B) 1000
C) 10000
D) 100000
E) none

Rationale: let c be the cost of producing and selling x books let r be the revenue made for selling x books r = selling price of 1 book × number of books sold r = 9 x c = fixed cost + variable cost variable cost = fee charged for 1 book × number of books sold variable cost = 4 x c = 50000 + 4 x r = c 9 x = 50000 + 4 x 9 x - 4 x = 50000 + 4 x - 4 x 5 x = 50000 x = 10000 since 5 × 10000 = 50000 the break even point is to sell 10000 books . answer c
Answer: C