This question about Managerial Economics.

Suppose that the hourly production of hamburgers depends on the number of grills and workers hired each hour according to the Cobb Douglas production function:

q = 10K^1/2 L^1/2 

Grills and workers can each be rented for $4 per hour

By using cost minimizing principle, please find the optimal number of hamburgers that can be produced within an hour.