You order from a catalog the following office supplies: 10 boxes of paper, each box is 6 pounds and 36 boxes of pens, each box weighs 12 ounces. Shipping charges are $12.00 for the first 20 pounds, $10.00 for the next 30 pounds, $0.50 per pound for the next 50 pounds. options are $22.00 $40.50 $87.00 $105.00