The factory produces 1200 computers this year, which is 20% less than last year. How many computers were produced last year?
工厂今年生产1200台电脑，比去年减少二成，去年生产电脑多少台．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_200 / (4/5)</gadget>
<output>1_500</output>

<result>1_500</result>