Constraint Problem

Sport Luck makes baseballs and soccer balls in a three-step process. The sewing machine has been identified as the bottleneck in the process. Each soccer ball has a contribution margin of $6.00 and each baseball has a contribution margin of $2.00. The sewing machine can make 10 soccer balls or 25 baseballs in one hour.

If demand for both products is unlimited and the sewing machine capacity cannot be expanded, which product should be produced?

Why?