If purchase price + rehab= 150, to determine investors purchase price, Subtract 40k(rehab) = 110k5.

It's a little esoteric because it's more theoretical since it just feels like cash is leaving your pocket.The pay down of principal on a loan is included in the net worth return calculation because on a monthly basis the liability is shrinking, thus increasing your networth on the other side of the equation as assets are subtracted less and less each time.Also I might be mistaken but wasn't the equation from Craig Curelop's book? 

What amenities do they offer that you can also add/subtract from your property?

You can add them subtract them use conditional logic.. truly fascinating and a POWERFUL tool to master.Imagine you are in a city, and one investor is in that city, and the rest are homeowners.Let's make an assumption that DMM actually works (it truly doesn't, but let's assume it does).If one investor sends everyone mailers, great!

You subtract your $400k purchase price and your profit is $180k, (maybe $40k in federal taxes?) 

With a $300k value, your friend is entitled to $72,180 then subtract the $82k she already received and she would owe you almost $10k.

Regardless, the rule is around 1% of the value of the home so subtract $7,200/year inlcuding general maintenance.

Subtracting the realtor commissions would produce a net to HUD of 88% ($255,200). 

Oh, and just some quick math if you haven't already done so, your remaining VA qualification through entitlement is calculated by subtracting your original VA loan amount from your first purchase price against $766,550 here in Florida, and that is the maximum purchase price that you can qualify for, with a second VA loan, without having to put extra down payment. 

I do have to pay the interest separately, though, but the policy is also growing at the same time.The ACV is much less than the death benefit, and any money borrowed out is subtracted from the death benefit.