If each bulb uses 60 watts each day, the 40 bulbs that Allyn has uses 60*40 = <<60*40=2400>>2400 watts of power each day.
In June, with 30 days, the bulbs will use 30*2400 = <<30*2400=72000>>72000 watts of power.
If Allyn is charged an electricity bill of twenty cents per power watt used, in June she will pay 72000*$0.20 = $<<72000*0.20=14400>>14400
#### 14400