Xiaoyang’s electricity bill in January this year is 84.2 yuan, the electricity bill in February is 15.4 yuan less than that in January, and 5.8 yuan more in March than in February. How much is the electricity bill in March?
小洋家今年一月份的电费是84.2元，二月份的电费比一月份少15.4元，三月份比二月份多5.8元，求三月份的电费是多少元？
<gadget id="calculator">84.2 - 15.4</gadget>
<output>68.8</output>

<gadget id="calculator">68.8 + 5.8</gadget>
<output>74.6</output>

<result>74.6</result>