A) Food cost :- In food cost , we have to take I to account of opening stock , closing stock , food consumed by staff, purchase of food, beverage and complimentary served food items.
For example , If  Total sales = 30000
                         Opening stock = 1000
                        Purchase made = 10000
                        Closing stock     =500
        Food consumed by staff = 1000
    Complimentary food items = 500
Now we will do solution , 
 Opening stock = 1000
 Fresh Purchase made     =  10000
We will add these two = 11000
Now we will reduce closing stock = 500
It will be = 10,500
Again we will reduce food item consume by staff ,  1000
It will be = 9,500
Again, we will reduce complimentary food , which will be 500 ,
It will be 9,000
Now , food cost percentage to net sales, we will use formula
Total food cost * 100 divided by total sales
 9000/ 30000 * 100 = 30% which is our food cost percentage to net sales. 
B) Labour cost :- To calculate labour cost we have to include all expenditure incurred in staff and on their welfare . It includes wage, salaries, uniform, Accomodation 
For example :-  if,
Total sales = 50000
Wages and salary paid = 5000
Employee provident fund = 1000
Medical re-imburstment = 500
Uniform allowance = 500
Free telephone at home = 500
Now we have to add all of them beside Total sales , and the formula is , 
Total labour cost / Total sales * 100
So , 7500 /50000 * 100 = 15%
Thus, labour cost percentage to net sales is 15%
C) Overheads :-  All other cost like office expenses, rent , power and light expenses, water , gas , fuel and advertising , marketing expenses fall under overheads
For example , if Total sales = 20000
Rent = 2000
Commission= 500
Depreciation= 1000
Gas and fuel = 500
Advertisement = 500
Laundry = 300
Electricity = 200
Water = 500
We have to add all overheads cost , which will be 6000 and now formula will be,
     Total overhead / Total sales * 100
= 6000/ 20000 * 100 which will be 30% to net sales. 
 
 


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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