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weigthed average in Excel spreadsheet

LeTay asked
Last Modified: 2015-02-27
I already asked something similar.
It was just to now how to calculate a weigthed average in Excel
So now I have this in some cells :
The "weights" are in column A2...An
The "scores" are in column C2...Cn for person C, D2..Dn for person D etc...
The weighted averages are in  A1..X1 using this formula (thanks to EE !), for example for person C

But now I come with something more complex to calculate !
There are now two "weights column, says A and B
All scores are always positive but I put a score positive, if its weight is in column A and as negative (a tric) if in fact it is of course positive, but the weight is in column B !
How now to calculate the weigthed averages
A       B       C
2       3        50
1       4       -40
The weigthed average for column C is ((2 * 50) + (4 * 40)) / (2 + 4)
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