You need to buy some filing cabinets. You know that Cabinet X costs $10 per

Question

unit, and requires six square feet of floor space. Cabinet Y costs $20 per unit,
and requires eight square feet of floor space. You have been given $140 for this
purchase, though you don't have to spend that much. The office has room for no
more than 72 square feet of cabinets. Let x = number of model X cabinets
purchased and y= number of model Y cabinets purchased
A. If Cabinet X holds 8 cubic feet of files, and Cabinet Y holds 12 cubic feet
of files, how many of which model should you buy, in order to maximize
storage volume?
B. Find inequalities also