What is 5 0.1 minus 3 0.01?
5个0.1减去3个0.01是多少．
<gadget id="calculator">0.1 * 5</gadget>
<output>0.5</output>

<gadget id="calculator">0.01 * 3</gadget>
<output>0.03</output>

<gadget id="calculator">0.5 - 0.03</gadget>
<output>0.47</output>

<result>0.47</result>