When 100 cubic meters of water freezes, its volume becomes 115 cubic meters. What percentage does the volume increase after the water freezes?
100立方米的水结成冰后的体积变成115立方米，水结成冰后体积增加了百分之几？
<gadget id="calculator">115 - 100</gadget>
<output>15</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>