The factory used 200,000 yuan to build a factory building, which is 10% less than the plan. How much was the original plan?
工厂建厂房用了20万元，比计划节约了10%，原计划用多少万元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">20 / (9/10)</gadget>
<output>200/9 = around 22.222222</output>

<result>200/9 = around 22.222222</result>