3. A firm has fixed costs of $2,000. Its short-run production function is y = 4x - 1/2 : where x is the amount of variable factor it uses. The price of the variable factor is $3,000 per unit. Where y is the amount of output, the short-run total cost function is a. 5,000y. b. 2,000 + 3,000y. c. 2,000/y + 3,000. d. 2,000 + 187.5012. e. 2,000y + 0.1912