A set of sportswear is priced at 320 yuan. After a 20% discount, how much is the current price cheaper than the original price?
一套运动服售价320元，打八折后，现价比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">320 * (4/5)</gadget>
<output>256</output>

<gadget id="calculator">320 - 256</gadget>
<output>64</output>

<result>64</result>