A 15% discount on a top can save 45 yuan, how much does it actually cost to buy this dress.
一件上衣打八五折可节省45元，买这件衣服实际要花多少元．
<gadget id="calculator">1 - 0.85</gadget>
<output>0.15</output>

<gadget id="calculator">45 / 0.15</gadget>
<output>300</output>

<gadget id="calculator">0.85 * 300</gadget>
<output>255</output>

<result>255</result>