The school laid a plastic runway, and the actual investment was 200,000 yuan, which was (1/5) less than the original plan. How much is the original plan to invest?
学校铺设一条塑胶跑道，实际投资20万元，比原计划节约(1/5)．原计划投资多少万元？
<gadget id="calculator">1 / 5</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">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>