The selling price of a certain commodity is 28 yuan after the price is reduced (1/10) from the original price. Find the original price in yuan. what is the correct formula
某种商品的售价比原来降价(1/10)后是28元，求原价多少元．正确的算式是多少
<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">28 / (9/10)</gadget>
<output>280/9 = around 31.111111</output>

<result>280/9 = around 31.111111</result>