The original price of a kind of clothing is 180 yuan, and now the price is reduced by 20%. How much is the current price.
一种服装原价180元，现在降价20%．现在的售价是多少元．
<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">180 * (4/5)</gadget>
<output>144</output>

<result>144</result>