Zero amount, then ask him how much did he stake on same bet? how did he know there's a guarantee in that bet? if he truly knows that it's a sure bet then he would have go for it first before telling me, they do this to pull us in when they know that there's no more hope for them and they don't have enough money to bet for themselves, there's no sure vet in gambling, we all take risk for betting to win or loose, if you think it's worth taking a risk on then stake the amount of money you could afford to loose on the bet.
The more you're being desperate for winning is the more the increase in the chances of loosing the entire for on that bet, no guarantee on any bet as 100% newbie should not be decieved
Sometimes trouble will be sleeping and we will be going around disturbing it to wake up on our request, did i just heard you with an alternative of taking a loan? any person involved in this kind of mess should definitely be a novice in gambling and needs to be oriented before they enter into debt which is a big time trouble.