Knowing that you use 275 kwh from 7am-7pm and 265 kwh 7pm-7am, answer the question.

how much have you paid on the nighttimer plan?
nighttimer plan: if more than 50% of usage is outside of 7pm-7am, then you have to pay the daytimer rate for all power used between 7am-7pm. $0.06445/kwh

daytimer: as long as most power used if from 7am-7pm, then you receive a 20% discount on power usage between 7pm-7am.
$0.06831/kwh