I have a basic excel spreadsheet like this:
A B C D etc.. 10% 219.10 34.2 6.4 etc.. 6% 45.10 36.2 7.4 etc.. 4% 419.10 54.2 9.4 etc.. Totals: [SUM] [SUM] [SUM] ( -- update - need totals here -- )
I would like to sum all the values in column B, C and D. Each cell value needs to be multiplied by the % in column A before doing the sum()
I could manually create a new column to contain the % calculation, and sum that column up, but I’m hoping to do it without the additional column.
I found this which I think is on the right track but am a little lost at implementing it.
(planning to write this calculation to an excel spreadsheet created from a php script based on values in a simple mysql database)
For the updated question, all you need is (in B5)
=SUMPRODUCT(B2:B4 * $A2:$A4)
Copy to the right
For E2, use
=SUMPRODUCT(B2:D2 * $A2)
This means B2*A2 + C2*A2 + D2*A2.
But, did you know that mathematically speaking, it is the same as
B2*A2 + C2*A2 + D2*A2 = A2 * (B2+C2+D2)
Which is just this below?
Looking at your etc, if you need to expand it rightwards, just keep column A locked in SUMPRODUCT, or use the SUM. Example below for up to J
=SUMPRODUCT(B2:J2 * $A2) =A2*SUM(B2:J2)
And copy down.
These are generally expressed by the control-shift-enter idiom