I need help with the blank section below. Please explain

Past experience has shown that the fixed manufacturing overhead component included in the cost per machine hour averages $26. Kitchen Magician's management has a policy of filling all sales orders, even if it means purchasing units from outside suppliers. If 78,000 machine hours are available, and management desires to follow an optimal strategy, how many units of each product should the firm manufacture? How many units of each product should be purchased? With all other things constant, if management is able to reduce the direct material for a electric mixer to $21 per unit, how many units of each product should be manufactured? Purchased? Note: Round your intermediate calculations to 2 decimal places