A certain commodity is sold at the original price, and the profit per piece is 25% of the cost. Later, it is sold at a 10% discount. As a result, the number of pieces sold every day is 25 times that before the price reduction. ?
某商品按原价出售，每件利润为成本的25%，后来打九折出售，结果每天售出的件数是降价前的25倍，降价后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) * 25</gadget>
<output>25/8 = around 3.125</output>

<gadget id="calculator">(25/8) - (1/4)</gadget>
<output>23/8 = around 2.875</output>

<result>23/8 = around 2.875</result>