Our production manager has informed me that we are currently using capital and labor to produce output according to the following production...

Our production manager has informed me that we are currently using capital and labor to produce output according to the following production function: Q= K1/2 L1/2. Our accounting team has informed me that we currently pay an hourly wage of $4 to labor and an hourly rental rate of $64 to capital and we are employing 64 workers with 36 french fry machines. 

What is the optimal level of production? Note: labor & capital must be in whole units.