After increasing 0.3, the number obtained is 3 times of it.
0.3增加多少后，所得的数是它的3倍．
<gadget id="calculator">0.3 * 3</gadget>
<output>0.9</output>

<gadget id="calculator">0.9 - 0.3</gadget>
<output>0.6</output>

<result>0.6</result>