If an electronic product was sold at 80% of the price last year, it could gain 20% of the profit. Since the purchase price this year is lower, it can be sold at 70% of the same price, and it can obtain 20% of the profit. Then ((this year’s purchase price)/( Last year's purchase price)) = how much.
某电子产品去年按定价的80%出售，能获得20%的赢利，由于今年买入价降低，按同样定价70%出售，即能获得20%的赢利，那么((今年买入价)/(去年买入价))=多少．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 * (7/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(7/10) / (6/5)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 * (4/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / (6/5)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(7/12) / (2/3)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>