The original price of a commodity is 50 yuan, the price is first reduced by 10%, and then the price is increased by 10%, what is the current price?
一种商品原价50元，先降价10%后，再提价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>9/10 = around 0.9</output>

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

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

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