[JimmyCh]

This should work:

pawn Код:

CMD:buyproducts(playerid, params[])
{
    new string2[128];
    if(PlayerInfo[playerid][pBizKey] != INVALID_BIZZ_ID && (IsPlayerInRangeOfPoint(playerid, 2.0, BizInfo[PlayerInfo[playerid][pBizKey]][IXCoord], BizInfo[PlayerInfo[playerid][pBizKey]][IYCoord], BizInfo[PlayerInfo[playerid][pBizKey]][IZCoord])))
    {
        if(GetPlayerCash(playerid < params[0]*10))
        {
            if(sscanf(params, "i", params[0])) return SendClientMessageEx(playerid, COLOR_GRAD3, "USAGE: /buyproducts [amount]");
            GivePlayerCash(playerid, -params[0]*10);
            BizInfo[PlayerInfo[playerid][pBizKey]][Products] += params[0];
            SaveBizInfo(PlayerInfo[playerid][pBizKey]);
            format(string2,sizeof(string2),"You have bought %d amount of business products", params);
            SendClientMessageEx(playerid, COLOR_GRAD3, string2);
            return 1;
        }
        else return SendClientMessageEx(playerid, COLOR_GRAD2, "You don't have 100$ for each product.");
    }
    else return SendClientMessageEx(playerid, COLOR_GRAD2, "You don't own a business, or are not inside one of them.");

return 1;
}

Anyway if it doesn't work, show me what errors you are getting.