The coffee shop launched a new cup, priced at 88 yuan/piece, and the price was lowered during the actual sale. As a result, the sales volume increased (1/4) and revenue increased (3/20) than expected, and the price of each cup was reduced how much.
咖啡店新推出一款杯子，定价是88元/个，实际销售时降了价，结果销量比预计的增加了(1/4)，收入增加了(3/20)，则每个杯子被降价多少元．
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">1 / 4</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">(23/20) / (5/4)</gadget>
<output>23/25 = around 0.92</output>

<gadget id="calculator">1 - (23/25)</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">88 * (2/25)</gadget>
<output>176/25 = around 7.04</output>

<result>176/25 = around 7.04</result>