A pair of earphones used to be 80 yuan, but now they are sold at the original price (4/5), how much is the price of each pair now?
一种耳机原来一副80元，现在按原价的(4/5)销售，现在每副售价多少元？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 * (4/5)</gadget>
<output>64</output>

<result>64</result>