Uncle Wang's family produced 1,200 kilograms of corn per mu last year. This year, due to the drought, the production has decreased by 40%. How many kilograms per mu this year?
王伯伯家去年每亩产玉米1200千克，今年由于旱灾，减产四成，今年亩产多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_200 * (3/5)</gadget>
<output>720</output>

<result>720</result>