A piece of clothing is priced at 45 yuan, which is 15 yuan cheaper than the original price. How much is this dress cheaper than the original price?
一件衣服售价45元，比原价便宜15元．这件衣服比原价便宜了百分之几？
<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>