The taxi fare in Shanghai is as follows: starting price: 12 yuan for 0-3 kilometers, and 2.4 yuan for every kilometer above 3 kilometers. Xiaohua is going to grandma's house in X kilometers (X>3), how much should the fare be?
上海市出租车的收费标准是，起步价：0～3千米12元，3千米以上每千米加收2.4元．小华要去X千米(X＞3)的奶奶家，应付车费多少元．
<gadget id="calculator">4.8 + 2.4</gadget>
<output>7.2</output>

<result>7.2</result>