Need to buy some filing cabinets. you know that cabinet x costs $10 per 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. cabinet x provides 8 cubic feet of storage, and cabinet y provides 12 cubic feet of storage.