Calculating a bill using a graduated rate...

I'm trying to calculate an electricity bill which uses different values based
on the amount used. For the first 600 kwh, the charge is .06/kwh. For
anything above 600 kwh, the charge is .08/kwh. So if my usage is 700 kwh, my
bill is $36+$8. Any ideas on which formula I should use for this?

=IF(A1<=600,A1*0.06,36+(A1-600)*0.08)

--

Vasant



"Dave Smith" <Dave Smith@discussions.microsoft.com> wrote in message
news:321B2696-2884-488C-81B5-21542439AA93@microsoft.com...
> I'm trying to calculate an electricity bill which uses different values
based
> on the amount used. For the first 600 kwh, the charge is .06/kwh. For
> anything above 600 kwh, the charge is .08/kwh. So if my usage is 700 kwh,
my
> bill is $36+$8. Any ideas on which formula I should use for this?

Thanks Vasant.

Now what if the rate calculation gets more complicated? Is there some way
to use a lookup table? For example:

0-600 costs .06 per kwH
601-800 costs .08 per kwH over 600
801-1000 costs .10 per kwH over 800
1001-1200 costs .15 per kwH over 1000
>1200 costs .30 per kwH over 1200


"Vasant Nanavati" wrote:

> =IF(A1<=600,A1*0.06,36+(A1-600)*0.08)
>
> --
>
> Vasant
>
>
>
> "Dave Smith" <Dave Smith@discussions.microsoft.com> wrote in message
> news:321B2696-2884-488C-81B5-21542439AA93@microsoft.com...
> > I'm trying to calculate an electricity bill which uses different values
> based
> > on the amount used. For the first 600 kwh, the charge is .06/kwh. For
> > anything above 600 kwh, the charge is .08/kwh. So if my usage is 700 kwh,
> my
> > bill is $36+$8. Any ideas on which formula I should use for this?
>
>
>

Another possibility is =A1*0.06+(A1>600)*(A1-600)*0.02
best wishes--
Bernard V Liengme
www.stfx.ca/people/bliengme
remove caps from email

"Dave Smith" <Dave Smith@discussions.microsoft.com> wrote in message
news:321B2696-2884-488C-81B5-21542439AA93@microsoft.com...
> I'm trying to calculate an electricity bill which uses different values
> based
> on the amount used. For the first 600 kwh, the charge is .06/kwh. For
> anything above 600 kwh, the charge is .08/kwh. So if my usage is 700 kwh,
> my
> bill is $36+$8. Any ideas on which formula I should use for this?

Dave

Have a look at JE McGimpsey's variable rate formula(s).

http://www.mcgimpsey.com/excel/variablerate.html


Gord Dibben Excel MVP

On Sun, 22 May 2005 10:51:04 -0700, "Dave Smith"
<DaveSmith@discussions.microsoft.com> wrote:

>Thanks Vasant.
>
>Now what if the rate calculation gets more complicated? Is there some way
>to use a lookup table? For example:
>
>0-600 costs .06 per kwH
>601-800 costs .08 per kwH over 600
>801-1000 costs .10 per kwH over 800
>1001-1200 costs .15 per kwH over 1000
>>1200 costs .30 per kwH over 1200
>
>
>"Vasant Nanavati" wrote:
>
>> =IF(A1<=600,A1*0.06,36+(A1-600)*0.08)
>>
>> --
>>
>> Vasant
>>
>>
>>
>> "Dave Smith" <Dave Smith@discussions.microsoft.com> wrote in message
>> news:321B2696-2884-488C-81B5-21542439AA93@microsoft.com...
>> > I'm trying to calculate an electricity bill which uses different values
>> based
>> > on the amount used. For the first 600 kwh, the charge is .06/kwh. For
>> > anything above 600 kwh, the charge is .08/kwh. So if my usage is 700 kwh,
>> my
>> > bill is $36+$8. Any ideas on which formula I should use for this?
>>
>>
>>

How about
=A1*0.06+(A1>600)*(A1-600)*0.02+(A1>800)*(A1-800)*0.04+(A1>1000)*(A1-10000)*0.05+(A1>1200)*(A1-1200)*0.15
OR
=MIN(A1,600)*0.06+MAX(0,MIN(200,A1-600))*0.08+MAX(0,MIN(200,A1-800))*0.1+MAX(0,MIN(200,A1-1000))*0.15+MAX(0,A1-1200)*0.3

To quote my Irish math teacher from long ago:there are more ways of killing
a pig than stuffing it with butter!
--
Bernard V Liengme
www.stfx.ca/people/bliengme
remove caps from email

"Dave Smith" <DaveSmith@discussions.microsoft.com> wrote in message
news:DC148B3E-AD94-420A-A64D-910D650A57AE@microsoft.com...
> Thanks Vasant.
>
> Now what if the rate calculation gets more complicated? Is there some way
> to use a lookup table? For example:
>
> 0-600 costs .06 per kwH
> 601-800 costs .08 per kwH over 600
> 801-1000 costs .10 per kwH over 800
> 1001-1200 costs .15 per kwH over 1000
>>1200 costs .30 per kwH over 1200
>
>
> "Vasant Nanavati" wrote:
>
>> =IF(A1<=600,A1*0.06,36+(A1-600)*0.08)
>>
>> --
>>
>> Vasant
>>
>>
>>
>> "Dave Smith" <Dave Smith@discussions.microsoft.com> wrote in message
>> news:321B2696-2884-488C-81B5-21542439AA93@microsoft.com...
>> > I'm trying to calculate an electricity bill which uses different values
>> based
>> > on the amount used. For the first 600 kwh, the charge is .06/kwh. For
>> > anything above 600 kwh, the charge is .08/kwh. So if my usage is 700
>> > kwh,
>> my
>> > bill is $36+$8. Any ideas on which formula I should use for this?
>>
>>
>>

As suggested by Gord Dibben, using JE McGimpsey's variable rate
formula...

=SUMPRODUCT(--(A1>{0,600,800,1000,1200}),A1-{0,600,800,1000,1200},{0.06,0
..02,0.02,0.05,0.15})

Hope this helps!

In article <DC148B3E-AD94-420A-A64D-910D650A57AE@microsoft.com>,
"Dave Smith" <DaveSmith@discussions.microsoft.com> wrote:

> Thanks Vasant.
>
> Now what if the rate calculation gets more complicated? Is there some way
> to use a lookup table? For example:
>
> 0-600 costs .06 per kwH
> 601-800 costs .08 per kwH over 600
> 801-1000 costs .10 per kwH over 800
> 1001-1200 costs .15 per kwH over 1000
> >1200 costs .30 per kwH over 1200

On Sun, 22 May 2005 10:51:04 -0700, "Dave Smith"
<DaveSmith@discussions.microsoft.com> wrote:

>Now what if the rate calculation gets more complicated? Is there some way
>to use a lookup table? For example:
>
>0-600 costs .06 per kwH
>601-800 costs .08 per kwH over 600
>801-1000 costs .10 per kwH over 800
>1001-1200 costs .15 per kwH over 1000
>>1200 costs .30 per kwH over 1200

Set up a rate table somewhere on your worksheet.


kWh Base Rate
0 $ 0.00 $0.06
600 $36.00 $0.08
800 $52.00 $0.10
1000 $72.00 $0.15
1200 $102.00 $0.30


The kWh and Rate columns are what you have given.

The Base rate is computed using a formula of the type:

If the table is in J1:L5 then:

K3: =(J3-J2)*L2+K2

and copy/drag down.

Then, with the usage in A2, use the following formula to compute the bill:

=VLOOKUP(A2,RateTable,2)+
(A2-VLOOKUP(A2,RateTable,1))*
VLOOKUP(A2,RateTable,3)




--ron