A commodity is first raised by 10%, but no one cares about it, so it has to be sold at a 10% lower price. At this time, the selling price is 198 yuan. What is the original price?
一种商品，先提价10%，无人问津，只好再降价10%出售，这时的售价是198元，原价是多少元．
<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">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">198 / (9/10) / (11/10)</gadget>
<output>200</output>

<result>200</result>