The price of a commodity is reduced from 100 yuan to 90 yuan, which is a few percent reduction. How much is the correct column
一件商品的售价由原来的100元，降低到90元，降低了百分之几．正确列式多少
<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>