A number is composed of 3 tens and 10 percent, how much is this number written.
一个数由3个十和10个百分之一组成，这个数写作多少．
<gadget id="calculator">10 * 0.01</gadget>
<output>0.1</output>

<gadget id="calculator">30 + 0.1</gadget>
<output>30.1</output>

<result>30.1</result>