Simple calculation: 22.5*0.39+7.75*3.9.
简算：22.5*0.39+7.75*3.9．
<gadget id="calculator">22.5 * 0.39</gadget>
<output>8.775</output>

<gadget id="calculator">7.75 * 3.9</gadget>
<output>30.225</output>

<gadget id="calculator">8.775 + 30.225</gadget>
<output>39</output>

<result>39</result>