A kind of clothes is sold at a 15% discount, which is 45 yuan cheaper than before. How much did you buy this dress originally?
一种衣服打八五折出售，比原来便宜45元，这件衣服原来买多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">45 / (3/20)</gadget>
<output>300</output>

<result>300</result>