Coal production was 1,500 tons in June, and 1,800 tons in July. What percentage increase was produced in July compared to June?
六月份产煤1500吨，七月份产煤1800吨，七月份比六月份增产了百分之几？
<gadget id="calculator">1_800 - 1_500</gadget>
<output>300</output>

<gadget id="calculator">300 / 1_500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>