A schoolbag, the original price is 50 yuan, first increase the price by 10%, then reduce the price by 10%, what is the current price
一个书包，原价50元，先提价10%，在降价10%，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>11/10 = around 1.1</output>

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

<gadget id="calculator">50 * (11/10) * (9/10)</gadget>
<output>99/2 = around 49.5</output>

<result>99/2 = around 49.5</result>