A set of clothes costs 120 yuan and is sold at a 25% discount. How much is it cheaper?
一套衣服120元，打七五折销售，便宜了多少钱？
<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">120 * (1/4)</gadget>
<output>30</output>

<result>30</result>