The original price of a TV set is 400 yuan. If the price is reduced by 10% and then increased by 10%, what is the current price?
一台电视机，原价400元，如果先降价10%后又提价10%，那么现价是多少元
<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">400 * (9/10) * (11/10)</gadget>
<output>396</output>

<result>396</result>