Wangcun produced 540 tons of grain last year and 637.2 tons this year. How much more grain is produced in Wangcun this year than last year?
王村去年生产粮食540吨，今年生产粮食637.2吨．王村今年生产的粮食比去年增产几成？
<gadget id="calculator">637.2 - 540</gadget>
<output>97.2</output>

<gadget id="calculator">97.2 / 540</gadget>
<output>0.18</output>

<result>0.18</result>