"Youth Literature and Art" (semimonthly) is priced at 3.60 yuan each, and "Children's Literature and Art" (monthly) is priced at 4.20 yuan each. How much does it cost to subscribe to both Longlong and Longlong magazines for a year?
《少年文艺》(半月刊)每本定价3.60元，《儿童文艺》(月刊)每本定价4.20元．龙龙两种杂志都订一年期的，一共要花多少钱？
<gadget id="calculator">3.6 + 4.2</gadget>
<output>7.8</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">7.8 * 24</gadget>
<output>187.2</output>

<result>187.2</result>