Kobayashi's weight increased from 40kg last year to 46kg this year, by what percentage?
小林的体重去年是40千克，今年增加到46千克，增加了百分之几？
<gadget id="calculator">46 - 40</gadget>
<output>6</output>

<gadget id="calculator">6 / 40</gadget>
<output>3/20 = around 0.15</output>

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