If a commodity is first reduced by 10% from the original price, and then raised by 10% according to the new price, what is the current price of the original price?
一种商品先按原价降低10%，再按新价提价10%以后，现在的价钱是原价的多少．
<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">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

<gadget id="calculator">1 * (9/10) * (11/10)</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>