"Science and Technology World" (semimonthly) is priced at 2.50 yuan each. The post office subscription price is 2.40 yuan, how much does Xiaoqiang charge for a one-year subscription to "Science and Technology World"?
《科技天地》(半月刊)每本定价2.50元．邮局订阅价格2.40元，小强预定一年的《科技天地》要多少钱？
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">2.4 * 24</gadget>
<output>57.6</output>

<result>57.6</result>