The monthly "Children's Encyclopedia Knowledge" is priced at 3.90 yuan each. Xiao Ming plans to subscribe for a year, how much will it cost?
月刊《少儿百科知识》每本定价3.90元．小明打算订一年的，要花多少钱？
<gadget id="calculator">3.9 * 12</gadget>
<output>46.8</output>

<result>46.8</result>