A commodity is sold at the original price, and the profit per piece is 25% of the cost. Later, it is sold at 90% of the original price. As a result, the number of pieces sold per day increases by 1.5 times compared with that before the price cut. How much has the total profit of operating this commodity increased every day compared with that before the price reduction.
某商品按原定价出售，每件利润为成本的25%，后来按原定价的90%出售，结果每天售出的件数比降价前增加了1.5倍．每天经营这种商品的总利润比降价前增加了多少．
<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">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(5/4) * (9/10)</gadget>
<output>9/8 = around 1.125</output>

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

<gadget id="calculator">(1/8) * 2.5</gadget>
<output>0.3125</output>

<gadget id="calculator">0.3125 - 0.25</gadget>
<output>0.0625</output>

<gadget id="calculator">0.0625 / 0.25</gadget>
<output>0.25</output>

<result>0.25</result>