The chalk in the store is 40 yuan per box, and the school bought 20 boxes. How much would it cost to buy 8 more boxes?
商店的粉笔每箱40元，学校买了20箱，如果再买8箱一共需要多少钱？
<gadget id="calculator">40 * 20</gadget>
<output>800</output>

<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<gadget id="calculator">800 + 320</gadget>
<output>1_120</output>

<result>1_120</result>