When Xiaohua went to the post office to subscribe to the "Primary School Student Weekly", the salesperson uncle told him that the monthly price was 2.40 yuan, and if he subscribed for the whole year, he could get a 10% discount. Please do the math for Xiaohua to order an annual "Primary School Student Weekly" "How much did it cost?
小华到邮局订阅《小学生周报》时，营业员叔叔告诉他每月的定价是2.40元，如果订全年的可优惠10%，请你帮小华算一算订一份全年的《小学生周报》共要花了多少钱？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">2.4 * 12 * (9/10)</gadget>
<output>25.92</output>

<result>25.92</result>