The price of potatoes this winter is 1.4 yuan per kilogram. A school cafeteria buyer brought 500 yuan and bought 240 kilograms of potatoes. How much is left?
今年冬天土豆的价格是每千克1.4元，某学校食堂采购员带了500元，买了240千克土豆，还剩多少元？
<gadget id="calculator">240 * 1.4</gadget>
<output>336</output>

<gadget id="calculator">500 - 336</gadget>
<output>164</output>

<result>164</result>