After 20% of 150 kg of oil is used up, and the remaining 20% is used, how many kg are left
150千克的油用了20%后，又用了余下的20%，还剩多少千克
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5) * (4/5)</gadget>
<output>96</output>

<result>96</result>