A newspaper, if you only subscribe for one month, each copy costs 15 yuan, if you subscribe for one year, you can get a 20% discount, Xiaohong subscribes to this newspaper for 1 cent throughout the year, how much does she have to pay.
一种报纸，如果只订一个月，每份需要15元，如果连续订一年，可以优惠20%，小红全年订了1分这种报纸，她要付多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * 12 * (4/5)</gadget>
<output>144</output>

<result>144</result>