Opening inventory + purchases – closing inventory.
purchase cost of these goods should therefore not be included in the cost of sales of the period.
CHAPTER 7
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INVENTORY
109
1.2 The cost of goods sold
The cost of goods sold is found by applying the following formula.
FORMULA TO LEARN
$
Opening inventory value
X
Add cost of purchases (or, in the case
of a manufacturing company, the
cost of production)
X
X
Less closing inventory value
(X)
Cost of goods sold
X
In other words, to match 'sales' and the 'cost of goods sold', it is necessary to adjust the cost of goods
manufactured or purchased to allow for increases or reduction in inventory levels during the period.
The 'formula' above is based on a logical idea. You should learn it, because it is a fundamental principle
of accounting.
1.3 Example: cost of goods sold
Perry P Louis, trading as the Umbrella Shop, ends his financial year on 30 September each year. On
1 October 20X4 he had no goods in inventory. During the year to 30 September 20X5, he purchased
30,000 umbrellas costing $60,000 from umbrella wholesalers and suppliers. He resold the umbrellas
for $5 each, and sales for the year amounted to $100,000 (20,000 umbrellas). At 30 September there
were 10,000 unsold umbrellas left in inventory, valued at $2 each.
Required
What was Perry P Louis's gross profit for the year?
Solution
Perry P Louis purchased 30,000 umbrellas, but only sold 20,000. Purchase costs of $60,000 and
sales of $100,000 do not represent the same quantity of goods.
The gross profit for the year should be calculated by 'matching' the sales value of the 20,000 umbrellas
sold with the cost of those 20,000 umbrellas. The cost of sales in this example is therefore the cost of
purchases minus the cost of goods in inventory at the year end.
$
$
Sales (20,000 units)
100,000
Purchases (30,000 units)
60,000
Less closing inventory (10,000 units @ $2)
20,000
Cost of sales (20,000 units)
40,000
Gross
profit
60,000
1.4 Example continued
We shall continue the example of the Umbrella Shop into its next accounting year, 1 October 20X5 to
30 September 20X6. During the course of this year, Perry P Louis purchased 40,000 umbrellas at a
total cost of $95,000. During the year he sold 45,000 umbrellas for $230,000. At 30 September 20X6
he had 5,000 umbrellas left in inventory, which had cost $12,000.
Required
What was his gross profit for the year?
Solution
In this accounting year, he purchased 40,000 umbrellas to add to the 10,000 he already had in
inventory at the start of the year. He sold 45,000, leaving 5,000 umbrellas in inventory at the year end.
Once again, gross profit should be calculated by matching the value of 45,000 units of sales with the
cost of those 45,000 units.
The cost of sales is the value of the 10,000 umbrellas in inventory at the beginning of the year, plus the cost
of the 40,000 umbrellas purchased, less the value of the 5,000 umbrellas in inventory at the year end.
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