A company to produces three products of materials electrical. Each unit of the first one requires 4 of raw material and 2 labor hours for processing and 2 boxes whereas each unit of the second requires 2 of raw materials and 5 labor hours and 5 boxes. And the last one needs 2 of raw material and 10 of labor hours and 3 boxes, The raw material is less than 60 and more than 90 labor hours and less than 40 boxes. The cost ( 60 $,30,20)