Computer Internet access charges, if the monthly payment, there is no discount, 60 yuan a month. If the annual one-time payment is made, a 20% discount is available for one year. How much does it cost to pay the one-time Internet fee for one year?
电脑上网收费，如果按月缴费，没有优惠，一个月需要60元．如果按年一次性缴费，一年可优惠20%，这样一次性缴一年网费需要多少钱？
<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">60 * 12 * (4/5)</gadget>
<output>576</output>

<result>576</result>