Split total by certain percentage Formulas

[Arinoum]

I am currently using this formula to apply percent of contribution to the total
=IF(SUM($H$3:$H$6)=1,F4*$I$6,"Error")

Percent of Contribution (Column H)	Bonus Split (column I)
0%	0
27.35%	2,294.12
32.45%	4,205.88
0%	0
Total	6,500

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Now I would like to change the formula to apply this:
Highest percent of contribution = 45% of total
Next highest percent of contribution = 30% of total
Next highest percent of contribution = 15%
and lowest percent of contribution = 10%

Any help would be greatly appreciated. Thanks!