The school purchased HP laser printers. Buy 5 printers in the store and pay 4,050 yuan; pay 6,000 yuan online to buy 12 identical printers. How much is it cheaper to buy a printer online than in a store?
学校购买惠普牌激光打印机．在商店购买5台，付款4050元；在网上付款6000元购买了12台同样的打印机．在网上购买一台打印机比在商店购买要便宜多少元？
<gadget id="calculator">4_050 / 5</gadget>
<output>810</output>

<gadget id="calculator">6_000 / 12</gadget>
<output>500</output>

<gadget id="calculator">810 - 500</gadget>
<output>310</output>

<result>310</result>