The eraser is 10 yuan per box, the purchase price is 19 yuan per box, and the retail price is 3 yuan per piece. This stationery store sells 28 yuan of erasers a day. How much is the profit?
橡皮每盒10块，进货价每盒19元，零售价每块3元，这个文具店一天共卖出橡皮28块，盈利多少元？
<gadget id="calculator">19 / 10</gadget>
<output>19/10 = around 1.9</output>

<gadget id="calculator">3 - (19/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) * 28</gadget>
<output>154/5 = around 30.8</output>

<result>154/5 = around 30.8</result>