Average on percentage but with different weightings

Riaang

Board Regular
Joined
Aug 29, 2002
Messages
146
Good day. I'm busy with performance reviews for staff but are battling with the following.

Section 1 for instance gives me an achieved percentage of 80% and the weighting for this section is 50.
Section 2 has a achieved percentage of 40% but the weighting for this section is only 30.
Section 3 has a achieved percentage of 60% but the weighting for this section is only 20.

I need to calculate the average percentage for the 3 sections together but I can't use 80% + 40% + 60% devide by 3 because the weighting for the 3 sections are not the same.

Can someone please help me in how I will get the average percentage for the 3 sections combined but taking in consideration the weighting.

Kind Regards
 

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