In the second quarter, Xiaoming's family paid 76 yuan for electricity in April and 114 yuan for electricity in May. His family decided to control the electricity bill to an average of 90 yuan per month, so how much should the planned electricity bill be in the last month of this quarter?
小明家在第二季度里，4月份交电费76元，5月份交电费114元．他家决定要将电费控制在每月平均90元，那么本季度最后一个月计划用电费应该是多少元？
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">270 - 76 - 114</gadget>
<output>80</output>

<result>80</result>