Where all the indirect costs incurred by a business are totalled and then divided and allocated to the different cost centres according to one criterion eg according to output by volume or value. Example. A firm sells 3 products: product A, product B and product C. Sales for each product represent 30%, 45% and 25% of total sales, respectively. Using full costing, 30% of the total indirect costs would, therefore, be allocated to A, 45% to B and 25% to C.