A factory purchased a set of equipment and spent 198,000 yuan, which was 10% less than the original plan. How much was the original plan? What is the correct column
某工厂购买了一套设备，用了19.8万元，比原计划节约了10%，原计划要用多少万元．正确列式是多少
<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">19.8 / (9/10)</gadget>
<output>22</output>

<result>22</result>