Shopping mall advertisement: "AA brand shirts are on sale with 10% off", which means that the current price of this kind of shirts is the original (how much).
商场广告："AA牌衬衫9折销售"，就是说这种衬衫现在的售价是原的(多少)．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>