The original price of a football is 80 yuan, but the price has been reduced by (1/5), what is the current price of the football.
一个足球原价80元，降价了(1/5)，这个足球现价是多少．
<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>64</output>

<result>64</result>