There are 180 kilograms of white sugar in the store. After adding 20% of it, sell another 20%, how many kilograms are left.
商店有白糖180千克，增加它的20%后，再卖出20%，余多少千克．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

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

<gadget id="calculator">180 * (6/5) * (4/5)</gadget>
<output>864/5 = around 172.8</output>

<result>864/5 = around 172.8</result>