The price of medicines has been reduced by 10%, which means that the current price is the original price
药品售价降低了10%，就是说现价是原价的多少
<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>

<result>9/10 = around 0.9</result>