A top was 630 yuan before the Spring Festival, and now it is sold at 40% off the original price. How much cheaper will it be to buy this top now than before the Spring Festival?
一件上衣春节前是630元，现在按原价的六折出售，现在买这件上衣比春节前会便宜多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">630 * (2/5)</gadget>
<output>252</output>

<result>252</result>