Thank you, Paul! that is very smart.

The 5.75 is calculated as 5+(4050-3375(sum of first 5 buyers))/900.

On Wednesday, July 9, 2014 4:03:21 PM UTC-4, Paul Schreiner wrote:
>
>  I used:
>  
> =IF(SUM(B$2:B2)<=$E$1,SUMPRODUCT(B$2:B2,C$2:C2)/SUM(C$2:C2),"")
>  
> and drug it down.
>  
> it shows values until Buyer #6
>  
>  
> I don't know how you came up with the .25 in your 5.25 anticipated result
>  
> *Paul*
> -----------------------------------------
>
>
>
>
>
>
>
> *“Do all the good you can,By all the means you can,In all the ways you 
> can,In all the places you can,At all the times you can,To all the people 
> you can,As long as ever you can.” - John Wesley*
> -----------------------------------------
>
>    *From:* maryann <jiangqi...@gmail.com <javascript:>>
> *To:* excel-...@googlegroups.com <javascript:> 
> *Sent:* Wednesday, July 9, 2014 11:14 AM
> *Subject:* $$Excel-Macros$$ Weighted Average till sum of exposure reaches 
> certain value.
>  
> Dear Guru, 
> I would like to calculate the weighted average of rating (weighted by 
> exposure) till the sum of exposure reaches certain value. please see table 
> below: 
>
> Buyer        Exposure        Rating 
> 1        900.00        6 
> 2        675.00        6 
> 3        675.00        6 
> 4        675.00        6 
> 5        450.00        6 
> 6        900.00        5 
> 7        675.00        5 
> 8        675.00        5 
> 9        675.00        5 
> 10        675.00        5 
> 11        675.00        5 
> 12        675.00        4 
>
>                  
> Total Exposure        4,050.00         
>
> I would like to first sort the ratings from highest to lowest, then 
> calculate the weighted average of Rating (weighted by exposure) till sum of 
> exposure is equals to Total exposure value (in this example 4,050. I will 
> sumproduct the first 5.25 buyers to reach my goal. if this is too complex, 
> sumproduct the first 6 buyers will also do the job. 
>
> Thanks in advance for your kind help. 
>
> Maryann 
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