Profit percentage = ((selling price-buying price)/(buying price))*100%, a clothing store sells clothes at 85% of the price last year, and can get a profit of 25%. If it is lowered and sold at 75% of the same price, but can get 30% profit, then, ((buy price this year)/(buy price last year))=how much.
盈利百分数=((卖出价-买入价)/(买入价))*100%，某服装商店出售服装，去年按定价的85%出售，能获得25%的盈利，由于今年买入价降低，按同样定价的75%出售，却能获得30%的盈利，那么，((今年买入价)/(去年买入价))=多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">0.75 / (13/10)</gadget>
<output>0.576923</output>

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

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(17/20) / (5/4)</gadget>
<output>17/25 = around 0.68</output>

<gadget id="calculator">0.576923 / (17/25)</gadget>
<output>0.848416</output>

<result>0.848416</result>