For a newspaper, if you subscribe once a month, there is no discount, and each copy is 28 yuan; if you subscribe once a year, you can get a 10% discount. How much yuan will you save if you subscribe to this newspaper every year compared to once a month?
一种报纸，如果一个月一订，没有优惠，每份28元；如果一年一订，可打九折，订阅一份这种报纸，一年一订比一个月一订节省多少元？
<gadget id="calculator">28 * 12</gadget>
<output>336</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">28 * (9/10) * 12</gadget>
<output>1_512/5 = around 302.4</output>

<gadget id="calculator">336 - (1_512/5)</gadget>
<output>168/5 = around 33.6</output>

<result>168/5 = around 33.6</result>