certain clothing store held a sales promotion, and all clothes were sold at a 25% discount. Aunt Zhang bought a skirt with an original price of 320 yuan, how much cheaper than the original one?
某服装商场搞促销活动，所有服装一律七五折销售，张阿姨买了一条原价320元的裙子，比原来便宜了多少元？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">320 * (1/4)</gadget>
<output>80</output>

<result>80</result>