Bina’s Umbrellas has a production function given by Q = 10K0.5L0.5, where MPL = 5K0.5/L0.5 and MPK = 5L0.5/K0.5. Bina is using 9 units of capital (K) in the short run. The wage (W) is $80 per day and the rental per unit of capital (R) is $5 per day. What is Bina’s total cost of producing 60 umbrellas?
A) $445
B) $365
C) $108
D) $276