Dad is going to buy a set of clothes, and the store is offering a 10% discount sale. Xiao Ming helps Dad do the math. If there is a 15% discount, it will be 30 yuan less than now. Do you know how much the original price of this suit is?
爸爸准备买一套服装，商店正在打九折促销，小明帮爸爸算了一下，如果打八五折的话，就比现在再少30元．你知道这套服装的原价是多少元吗？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">(9/10) - (17/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">30 / (1/20)</gadget>
<output>600</output>

<result>600</result>