Staking Plan Calculation

[thunderfoot]

I'm embarrassed to ask this question, but below is a staking/returns extract from a system I'm testing. Because of the overall returns this system shows I'd like a third opinion, because I can't quite believe the o'all return from back-testing.
Does the Accum. Return look right? i.e. it's the Gross Return added to the Accum. Return (as I show) not the Nett Return.
The Race Return has an allowance of 5% commission on Betfair.

Event	SP	W/L	BF Odds	Stake/Bet	Race Ret'n	Accum. Rt'n
1	2/1F	L		£2.00	-£2.00	-£2.00
2	2/1F	L		£2.00	-£2.00	-£4.00
3	5/1	L		£2.00	-£2.00	-£6.00
4	3/1	L		£2.00	-£2.00	-£8.00
5	3/1	L		£2.00	-£2.00	-£10.00
6	6/1	W	8.75	£2.00	£16.63	£6.63
7	11/10F	W	2.63	£2.00	£4.99	£11.61
8	7/4F	L		£2.00	-£2.00	£9.61
9	7/2	W	5.63	£2.00	£10.69	£20.30
10	7/2	L		£2.00	-£2.00	£18.30

[tipstar]

You've taken your 5% comm from your gross return instead of just from the profit.
ie
bet 6

(8.75-1) * 2 = 15.5 profit

15.5*0.95 (5%com)= 14.72

14.72 + 2 (stake) = 16.72 gross return

therefore
bet 6 = 16.72
bet 7 = 5.10
bet 9 = 10.80

accum ret = 18.62 gross....or....12.62 net

[thunderfoot]

Originally Posted by tipstar

You've taken your 5% comm from your gross return instead of just from the profit.
ie
bet 6

(8.75-1) * 2 = 15.5 profit

15.5*0.95 (5%com)= 14.72

14.72 + 2 (stake) = 16.72 gross return

therefore
bet 6 = 16.72
bet 7 = 5.10
bet 9 = 10.80

accum ret = 18.62 gross....or....12.62 net

Thank you 'Tipstar', sooo basically I've got the Accum. Return correct and just need to change the Commission calculation (well spotted).
I'm gonna be rich, rich, rich ...