The original price of a coat is 100 yuan, but the current price is 20% less than the original price. How much is the current price?
一件上衣原价100元，现价比原价少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">100 * (4/5)</gadget>
<output>80</output>

<result>80</result>