Xiaowang's family grows peanuts. Last year, the average yield per mu was 390 kilograms, an increase (1/12) compared to the previous year. How many kilograms of peanuts was the average yield per mu in the previous year? What is the correct column
小王家种花生，去年平均亩产390千克，比前年增产(1/12)，前年平均亩产花生多少千克？列式正确的是多少
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 + (1/12)</gadget>
<output>13/12 = around 1.083333</output>

<gadget id="calculator">390 / (13/12)</gadget>
<output>360</output>

<result>360</result>