A product is sold according to the planned price, and a profit of 25% can be obtained. Now a promotional activity is carried out on this product, and after the sale is 10% off the planned price, a profit of 8 yuan can still be made. The purchase price of this product is how much
一种商品按计划售价销售，可获得25%的利润，现在对这种商品搞促销活动，按计划售价的九折销售以后，仍可获利8元利润，这种商品的进价是多少元
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(1/4) * (9/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) - 1</gadget>
<output>-31/40 = around -0.775</output>

<gadget id="calculator">(9/10) + (-31/40)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">8 / (1/8)</gadget>
<output>64</output>

<result>64</result>