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On 10/01/13 17:38, Hylton Conacher (ZR1HPC) wrote:

I am using Calc 3.4.5 on openSuSe Linux 11.2

I am working on a spreadsheet to cater for the monthly measurement of
household electricity consumption, new unit purchase and costing of used

The electricity supplier gives me the first 150 units of electricity at
R1.29 per unit. The next 350 units are costed at R1.35 per unit.
Thereafter the units cost me R1.60 per unit. The monetary values per set
amount of unit changes when the electricity provider increases prices
i.e. the first 150 units might increase to R1.50 per purchased unit, the
next 350 units might be costed at R1.55 and thereafter units will cost

Each time I purchase electricity the units I am allocated are based on
the above sliding scale starting from 0.

How can I work out the number of units I will receive for a given
currency value i.e. R2000.00? i.e. x @ R1.29, y @ R1.35 and z @ R1.60=

In addition how could I work out the value of units consumed using the
above scale?

I am assuming the R values in the scale will change over time and these
can each be averaged to calculate the cost of units used, but the
problem is still to work out the formula.

Anybody have an idea if this is possible and where to start?

I am investigating results found on Google but would appreciate a
pointer or three.

The calculation of the number of unit of electricity across a sliding scale has been solved.

A member of this mailing list suggested using the IF formula. With some formula tweaking with &, it proved to be the right answer. Tnx to that member. I only wish they had corresponded via the mailing list as opposed to directly, as perhaps there would have been greater learning for all subscribers.

I have attached the completed to date file, via BCc email, for those who showed an interest in solving the problem, as I know the ML doesn't accept attachments. . I anyone else wants it, feel free to contact me directly at and request it.

I have tested the Purchases tab in the spreadsheet using LibreOffice 3.4.5 and using common currency values, it works.

Next are the other tabs etc.

Thanks again to those that helped
Hylton is a Lions Club member of Lions Club of Fish Hoek (District 410A) being part of the worlds
largest non profit NGO

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