The toll standard for small cars on a highway is 0.5 yuan per kilometer (including the tunnel), and an additional 20 yuan is charged for the tunnel toll. A car travels a total of 78.4 kilometers (including the tunnel) from point A to point B. How much is the total toll?
一高速公路对小车的收费标准是每千米0.5元(包含隧道)，此外还要加收隧道通行费20元．一小车从甲地到乙地共行了78.4千米(包含隧道)，共要交费多少元？
<gadget id="calculator">78.4 * 0.5</gadget>
<output>39.2</output>

<gadget id="calculator">39.2 + 20</gadget>
<output>59.2</output>

<result>59.2</result>