Expenses Classified by Nature (Tables)

12 Months Ended

Dec. 31, 2017

Expenses classified by nature for the years ended December 31, 2015, 2016 and 2017 are as follows:


		2015
		Selling and administrative expenses		Cost of sales		Total
		In millions of won
Raw materials used	￦		—		14,626,933		14,626,933
Salaries			655,432		2,962,476		3,617,908
Retirement benefit expense			61,903		320,700		382,603
Welfare and benefit expense			119,866		426,186		546,052
Insurance expense			10,636		83,910		94,546
Depreciation			102,867		8,158,884		8,261,751
Amortization of intangible assets			40,465		31,801		72,266
Bad debt expense			290		—		290
Commission			562,171		353,703		915,874
Advertising expense			30,085		8,498		38,583
Training expense			4,988		11,186		16,174
Vehicle maintenance expense			10,529		8,323		18,852
Publishing expense			3,124		3,981		7,105
Business promotion expense			3,338		4,312		7,650
Rent expense			44,905		142,054		186,959
Telecommunication expense			22,678		73,180		95,858
Transportation expense			753		5,336		6,089
Taxes and dues			55,970		397,161		453,131
Expendable supplies expense			7,272		29,874		37,146
Water, light and heating expense			9,558		26,870		36,428
Repairs and maintenance expense			74,330		1,771,760		1,846,090
Ordinary development expense			178,472		432,748		611,220
Travel expense			14,388		52,910		67,298
Clothing expense			5,751		4,135		9,886
Survey and analysis expense			590		3,071		3,661
Membership fee			1,040		6,401		7,441
Power purchase			—		11,428,027		11,428,027
Others			131,860		4,083,309		4,215,169

	￦		2,153,261		45,457,729		47,610,990


		2016
		Selling and administrative expenses		Cost of sales		Total
		In millions of won
Raw materials used	￦		—		13,470,586		13,470,586
Salaries			734,930		3,425,712		4,160,642
Retirement benefit expense			72,812		374,826		447,638
Welfare and benefit expense			162,243		507,691		669,934
Insurance expense			11,513		79,987		91,500
Depreciation			169,431		8,704,525		8,873,956
Amortization of intangible assets			35,171		44,544		79,715
Bad debt expense			38,719		—		38,719
Commission			605,879		423,179		1,029,058
Advertising expense			34,658		9,693		44,351
Training expense			6,314		13,347		19,661
Vehicle maintenance expense			10,390		7,016		17,406
Publishing expense			3,643		4,615		8,258
Business promotion expense			3,477		4,836		8,313
Rent expense			40,020		133,670		173,690
Telecommunication expense			25,448		75,925		101,373
Transportation expense			596		5,153		5,749
Taxes and dues			46,531		464,962		511,493
Expendable supplies expense			6,834		34,668		41,502
Water, light and heating expense			9,720		25,820		35,540
Repairs and maintenance expense			75,122		1,896,656		1,971,778
Ordinary development expense			188,063		517,441		705,504
Travel expense			16,115		63,611		79,726
Clothing expense			8,273		5,363		13,636
Survey and analysis expense			666		3,209		3,875
Membership fee			1,132		8,714		9,846
Power purchase			—		10,755,739		10,755,739
Others			331,532		4,488,065		4,819,597

	￦		2,639,232		45,549,553		48,188,785


		2017
		Selling and administrative expenses		Cost of sales		Total
		In millions of won
Raw materials used	￦		—		15,924,707		15,924,707
Salaries			735,383		3,479,591		4,214,974
Retirement benefit expense			71,094		397,852		468,946
Welfare and benefit expense			179,406		543,738		723,144
Insurance expense			15,414		90,677		106,091
Depreciation			190,245		9,461,974		9,652,219
Amortization of intangible assets			44,990		68,682		113,672
Bad debt expense			126,714		—		126,714
Commission			673,740		469,695		1,143,435
Advertising expense			114,519		10,917		125,436
Training expense			7,027		14,362		21,389
Vehicle maintenance expense			9,998		7,468		17,466
Publishing expense			3,672		4,248		7,920
Business promotion expense			3,700		4,973		8,673
Rent expense			38,380		148,509		186,889
Telecommunication expense			24,916		73,956		98,872
Transportation expense			495		9,145		9,640
Taxes and dues			48,395		437,643		486,038
Expendable supplies expense			7,731		31,994		39,725
Water, light and heating expense			10,545		30,150		40,695
Repairs and maintenance expense			63,477		2,047,943		2,111,420
Ordinary development expense			211,417		510,020		721,437
Travel expense			16,658		69,015		85,673
Clothing expense			8,410		4,985		13,395
Survey and analysis expense			698		3,661		4,359
Membership fee			1,122		8,482		9,604
Power purchase			—		14,264,331		14,264,331
Others			154,709		3,980,137		4,134,846

	￦		2,762,855		52,098,855		54,861,710