You know that the invoice price is obtained by adding a certain amount of profit to the cost price. The amount of profit which is added to the cost in order to arrive at the invoice price is called loading. In other words, loading is the difference between the invoice price and the cost price
Loading = IP - CP
For example, if the invoice price is Rs. 10000 and the cost price is Rs. 7500, the amount of loading will be
Loading = IP - CP or Number of units x (IP per unit - CP per unit)
= 10000 - 7500
= Rs. 2500
If the invoice price or the cost price is given and the profit (loading) is given in the form of a percentage either on IP or CP, the loading can be worked out directly in the same manner as we worked out the IP or CP.