3500/(900-893)*4=how much.
3500/(900-893)*4=多少．
<gadget id="calculator">900 - 893</gadget>
<output>7</output>

<gadget id="calculator">3_500 / 7</gadget>
<output>500</output>

<gadget id="calculator">500 * 4</gadget>
<output>2_000</output>

<result>2_000</result>