The school bought 6 repeaters of the same type and spent 840 yuan. If they buy 10 more repeaters like this, how much would it cost in total?
学校买了6台同样的复读机，花了840元，如果再买10台这样的复读机，一共要用多少元？
<gadget id="calculator">840 / 6</gadget>
<output>140</output>

<gadget id="calculator">140 * 10</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 + 840</gadget>
<output>2_240</output>

<result>2_240</result>