The price of a product is increased by 10% and then reduced by 10%. The current price is 198 yuan. What is the original price?
一种商品提价10%后又降价10%，现价是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>