The original price of a traditional Chinese medicine is 50 yuan. After two consecutive price reductions (1/10), what is the selling price?
一种中药原价50元，连续两次降价(1/10)后，售价是多少元
<gadget id="calculator">1 / 10</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">50 * (9/10) * (9/10)</gadget>
<output>81/2 = around 40.5</output>

<result>81/2 = around 40.5</result>