A Firm Has a Production Function of Q = KL

Multiple Choice

A firm has a production function of Q = KL + L, where MP_L = K + 1 and MP_K = L. The
Wage rate (W) is $100 per worker and the rental (R) is $100 per unit of capital. In the short run, capital (K) is fixed at 4 and the firm produces 100 units of output. The firm's long run total cost of producing 100 units of output is $____.

A) 3,000
B) 2,400
C) 1,900
D) 1,500