newspaper, if only ordered for one month, costs 30 yuan each. If you book for one year in a row, you can get a 10% discount. How much does it cost to subscribe to a year-round newspaper?
一种报纸，如果只订一个月，每份需要30元．如果连续订一年，可以优惠10%．订一份全年的报纸，一共需要多少元？
<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>

<gadget id="calculator">30 * (9/10) * 12</gadget>
<output>324</output>

<result>324</result>