Uncle Wang wants to subscribe to a monthly magazine. If you subscribe once a month, there is no discount, and you need 8 yuan per month. If you book once a year, you can get a 20% discount. Uncle Wang has subscribed for one year, how much does he need to pay?
王大伯要订阅一份月刊，如果一月一订，没有优惠，每月需要8元．如果一年一订，可以优惠20%．王大爷订阅了一年，需要付多少元？
<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">8 * (4/5) * 12</gadget>
<output>384/5 = around 76.8</output>

<result>384/5 = around 76.8</result>