The number A is 60% of the number B, and the number C is 30% of the number A. How much less is the number C than the number B?
甲数是乙数的60%，丙数是甲数的30%，问丙数比乙数少多少．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 * (3/5)</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) * (3/10)</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">1 - (9/50)</gadget>
<output>41/50 = around 0.82</output>

<gadget id="calculator">(41/50) / 1</gadget>
<output>41/50 = around 0.82</output>

<result>41/50 = around 0.82</result>