80% of a number is 3.2, what is 30% of this number?
一个数的80%是3.2，这个数的30%是多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3.2 / (4/5)</gadget>
<output>4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 * (3/10)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>