The original price of a commodity is 200 yuan, and the current price is 20% lower than the original price, what is the current price?
一种商品的原价是200元，现价比原来降低了20%，现价多少元．
<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">200 * (4/5)</gadget>
<output>160</output>

<result>160</result>