The original price of a commodity is 500 yuan, the price is increased by 10% and then reduced by 10%, what is the current price
一种商品原价500元，先提价10%再降价10%，现在售价多少元
<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">500 * (11/10) * (9/10)</gadget>
<output>495</output>

<result>495</result>