Asking for help re offer on my FSBO

[Account Closed]

I'm waiting for the details of the first offer on my FSBO. It's been on the market for 29 days today. It's a 3/2 in move in condition, AFAIK no repairs, major or minor, to be made. I have it listed at $149,500.
I understand the offer is $140K, with a VA loan, and the buyer is asking for 4% back. I understand that with a VA loan that the buyer can ask for 4% of the selling price. Is that correct?
Is it required that the seller agree to that 4%?
What percentage does the VA require from the seller?
What closing costs does the VA require the seller to pay?
What is the least I can agree to and still have the VA accept the term?
4% of 140K is $5600. 140-5600=134,400

Then there is the agent commission of 3% of the sale price,
3% of 140 000 = 4200 agent commission
Now I'm at 134,400-4200=130,200 for me to take to the bank. Less than that, because I still have MY closing costs...

Then there is the agent commission of 3% of the sale price,
3% of 140 000 = 4200 agent commission
Now I'm at 134,400-4200=130200

I’m doing some research now for recent sales. Some of the old info puts the price of this offer in line with a few offers on same size houses about a year ago, but I have no idea of their condition.
This 130 K for me is quite a bit less than what I need, what I was hoping for.
VA loan requirement info and suggestions on countering this, please.
I need to respond by 3PM tomorrow, Sunday
Thanks
Ofgift