Thread: Average price of 1 Kw/h

Hi all,

a problem to solve:

If for the first 20% of the time a kw/h costs 22.4p, then after that it only costs 9.8p per kw/h

What is the average price of 1 kw/h? and how do you solve this?

edit: this is to be worked out assuming the total kw/h used is 700.

thanks,

20% of 700 = 140
So you have 140 Kw/h at 22.4p and 560 Kw/h at 9.8p
or (140*22.4)+(560*9.8)=8624p or £ 86.24

or do you want:

86.24/700=12.32p Kw/h