Ricos Pizza sells an average of 900 small, 500 medium, and 300 large pizzas each month. The selling price of a small pizza is $45, a medium pizza is...

Ricos Pizza sells an average of 900 small, 500 medium, and 300 large pizzas each month. The selling price of a small pizza is $45, a medium pizza is $70, and a large pizza is $120. The cost of production for a small pizza is $28.50, for a medium pizza is $44.50 and for a large pizza is 75.5. Using operations involving vectors or matrices show that the average monthly profit is the same when calculated either as a total concept or as a per-unit concept. solution