The taxi fare in Yangjiang is 4 yuan within 2 kilometers (including 2 kilometers), and 1.4 yuan per kilometer after 2 kilometers. Xiaoming’s house is 15 kilometers away from grandma’s house. How much does it cost him to take a taxi to his grandmother's house?
阳江的出租车计价是2千米以内(含2千米)收费4元，超过2千米后每千米收费1.4元，小明家距外婆家15千米．他坐出租车到外婆家需多少元．
<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<gadget id="calculator">1.4 * 13</gadget>
<output>18.2</output>

<gadget id="calculator">4 + 18.2</gadget>
<output>22.2</output>

<result>22.2</result>