=+Electricity 2,500 3,000 3,500 4,000 4,700 Maintenance 4,000 3,750 3,400 3,000 2,800 ________ ________ ________ ________ ________ Total costs $ 26,500 $24,750 $28,900 $ 27,000 $27,500 Pounds produced ________ 10,000 ________ 9,000 ________ ________ ________ 11,000 10,000 10,000