ABCDE
1Budget Worksheet
2Budget100000
3
Fixed CostsAdditional PercentAdded AmountFinal Budget
4Rent265000=exremainder*exaddpercent=exfixed+exadded
5Wages368000.3=exremainder*exaddpercent=exfixed+exadded
6Cost of Goods Sold120000=exremainder*exaddpercent=exfixed+exadded
7Travel50000.5=exremainder*exaddpercent=exfixed+exadded
8Training20000.4=exremainder*exaddpercent=exfixed+exadded
9Total=SUM(exfixed)=SUM(exaddpercent)=SUM(exadded)=SUM(exfinalbudget)
10Remainder=T3-T10

This table was created by a free Excel macro written by Charles Balch.
Here's the code. It is care ware - it's yours for free if do something nice for anyone (anyone includes you).