A 100-yuan coat is priced up by 10% due to a popular seller, and then reduced by 10% due to seasonal reasons. How much is the coat now?
一件100元的大衣，由于热销商家提价10%，由于季节原因又降价10%，现在大衣多少元．
<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">100 * (11/10) * (9/10)</gadget>
<output>99</output>

<result>99</result>