Question

PLEASE HELP!
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

Answer 1

Fraction of total power used at night:
$$
f=\cfrac{265}{265+275}
$$
If \(f>0.5\) then use Daytime Plan. Use NightTimer plan otherwise

Is f > 0.5?

Answer 2

Yes.

Answer 3

Both Daytime and Nightimer plans say if most of the power used is between 7am-7pm then used the rates.

Are you sure you copied the problem correctly?

Answer 4

Daytime is 7am-7pm. NightTime is the opposite.

Answer 5

So Daytime plan says if most of power used is "outside" of 7pm-7am, which to me means 7am-7pm.

Wouldn't you say that's what this means?

Answer 6

Yes.

Answer 7

Daytime starts at 7am. NightTime starts at 7pm.

Answer 8

Doesn't this seem to mean if most power used is between 7am and 7pm then you get the discount rate?

DayTimer: As long as most power used \(is\) from 7am-7pm, then you receive a 20% discount on power usage between 7pm-7am.}

Are you \(sure\) that the NightTimer plan shouldn't read:

NightTimer Plan: If more than 50% of usage is outside of \(7\color{red}{a}m-7\color{red}{p}m\), then you have to pay the DayTimer rate for all power used between 7am-7pm.

Answer 9

No.. I wrote it down correctly.

Answer 10

There was a misspelling in DayTimer, which I corrected. Did your question have "if" or "is"?