Grandpa Wang’s early rice yield is 400 kilograms per mu this year, and late rice yield is 20% higher than early rice. What is the yield per mu of late rice?
王爷爷家今年的早稻亩产是400千克，晚稻比早稻增产二成，晚稻亩产是多少千克．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">400 * (6/5)</gadget>
<output>480</output>

<result>480</result>