I have a doubt where the 2,480 cost of good sold comes from?

Particulars	Amount	Amount
Sales revenue	5,000
Less: sales discounts	-
Net sales		5,000
Less: cost of goods sold (balance)		2,480
Gross profit		2,520
Total operating expenses		1,000
Income from operations		1,520
Other incomes and gains:
Interest revenue		100
Service revenue
Gain on disposal
Other expenses and losses:
Extraordinary loss		(400)
Research and development costs
Interest expense		642
Income before tax		1,862
Income tax expense		642
Net income		1,220
Number of shares outstanding		2,000
EPS		0.61

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