[101]

pawn Код:

new robmoney = (400-rob[id])/4)*3);
        GivePlayerMoney(playerid, robmoney);

error 001: expected token: ";", but found ")"

[Threshold]

You're just missing a few brackets, they amount of end brackets must equal the same as the beginning brackets.
Beginning = (
Ending = )

Your code:

pawn Код:

new robmoney = (((400-rob[id])/4)*3);
        GivePlayerMoney(playerid, robmoney);

[101]

Holy mother of god, how could I miss that! Thanks bro.

[Nero_3D]

Another important thing if you do maths with integer, always use the division as last!
Lets check out this example, normally you would think it works like that

158 / 4 * 3 = 39.5 * 3 = 118.5
158 * 3 / 4 = 474 / 4 = 118.5

But the truth is that the fractional part is cut off each time resulting in

158 / 4 * 3 = 39.5 * 3 => 39 * 3 = 117
158 * 3 / 4 = 474 / 4 = 118.5 => 118

pawn Код:

new robmoney = (((400 - rob[id]) * 3) / 4);

[Threshold]

Unless you made it a float value.

[Nero_3D]

There is no reason to make it a float if you need an integer afterwards
And if you would use floats that you just could do * 0.75 (one operation) instead of * 3 / 4 (two operations)