A product is 10 yuan, the price is increased by 10% and then the price is reduced by 10%, what is the current price of this product?
一件商品10元，提价10%后降价10%，这件商品的现价是多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

<gadget id="calculator">10 * (11/10) * (9/10)</gadget>
<output>99/10 = around 9.9</output>

<result>99/10 = around 9.9</result>