gain can be anything over your cost,normally revenue over your cost is treated 
as gain
     while profit=total revenue-total cost,which is the net icome of the 
organisation

Profit generally is the making of gain in business activity 
for the benefit of the owners of the business
gain can be anything over your cost.

gain:- total amt received by any transaction
                    or 
 total amt received - total cost

profit :- gain - taxable amt. 
                   or

total amt received- (total cost + tax paid )

PROFIT IS ARAISED AFTER ALL DEDUCTIONS AND EXPENSES.
GAIN IS ARAISE DON THE CAPITAL INVESTED.

PROFIT IS TREATED AS ALL REVENUE-ALL 
EXPENSES.                                                   
 GAIN IS TREATED AS COMPANY TOTAL PROFIT

profit: Income derived from the regular business activity, 
by deploying caplital labour and time.
In other words it is the return on the capital employed 
after deducting all working capital and fixed expenses.
usually appears on the liabilities side of the balance 
sheet.

Gain: Income derived on investment over a period of time 
time not falling under regular business activity.
it is the return derived on investment.

gain means gaining a business lead or reputation which is 
nothing but goodwill. Gain can be any gain which can be 
treated as benefit which is mostly short term. Profit is 
the gain in monetary terms after removing all costs, 
interests, reserves and taxes.