If a water cup is sold at 18 yuan, it will lose 25%; if it wants to make a profit of 25%, how much should it be priced at?
一个水杯如果按18元出售，则亏了25%；如果想盈利25%，应按多少元定价？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">18 / (3/4)</gadget>
<output>24</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">24 * (5/4)</gadget>
<output>30</output>

<result>30</result>