Aunt Zhang pays 25 yuan for the phone bill every month. According to this calculation, how much does she have to pay for the phone bill a year?
张阿姨每个月交电话费25元，照这样计算，她一年要交电话费多少元．
<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<result>300</result>