A chemical fertilizer factory has completed (4/5) of the annual production plan. If it produces 4800 tons again, it will be more than the annual plan (1/5). How many tons of chemical fertilizer is planned to be produced in the whole year?
某化肥厂已经完成了全年生产计划的(4/5)，如果再生产4800吨，就比全年计划多(1/5)，全年计划生产化肥多少吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/5) - (4/5)</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">1 + (-3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4_800 / (2/5)</gadget>
<output>12_000</output>

<result>12_000</result>