The toy store bought 35 sets of toys for 840 yuan, and sold them at a price of 28 yuan each. How much profit can the toy store make?
玩具店840元买了35套玩具，又以每套28元的价格卖了出去，玩具店可以获利多少元？
<gadget id="calculator">35 * 28</gadget>
<output>980</output>

<gadget id="calculator">980 - 840</gadget>
<output>140</output>

<result>140</result>