Blade-Z manufactures rollerblades. The production facility has fixed costs of $200 a day and total production costs of $4,200 per day at an output of 100 pair of skates per day. Which of the following equations represents the daily production cost for Blade-Z based on the number of skates manufactured?

(Let C(x) represent the daily production cost and x represent the number of pairs of skates manufactured.)

A. C(x) = 40x + 200
B. C(x) = 40x – 200
C. C(x) = 42x + 200
D. C(x) = 42x