The current price of a commodity is 80 yuan. The current price is 1/5 lower than the original price. What is the original price?
一种商品，现价80元，现价比原价降低了(1/5)，原价是多少元．
<gadget id="calculator">1 / 5</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">80 / (4/5)</gadget>
<output>100</output>

<result>100</result>