Far Cry 3 Making Money will give you all the tips on what you need to do.
Far Cry 3 Making Money will be one of the easiest things to collect but to spend it is another problem as you will need to be cautious on all that you loot and sell in the game. Here are some of the things you can do with the money you earn:
unlock the standard weapons for free by disabling radio scramblers, cash is mostly useful for buying ammunition, particularly at the midgame when you’ve got enough ammo capacity to be toting around an LMG or sniper rifle, and body armor.
looting every chest you run across while you’re exploring and traveling, acquiring more than enough money to keep you well supplied throughout most of the game. Ways to spend the money you make is try spending it on ammo for weapons, extra explosives, maps. In the late game, the signature weapons cost three to five grand each, and are all a worthwhile investment. Animals’ skins are only useful as another source of income. If you end up fighting and killing a hostile animal or happening across a fresh kill, their hides’ vendor value is usually anywhere from $10 to $50 and can be an excellent source of extra cash.