| 26. | Operating Expenses |
Operating expenses for the years ended December 31, 2015, 2016 and 2017, are as follows:
| (In millions of Korean won) | 2015 | 2016 | 2017 | |||||||||
|
Salaries and wages |
￦ | 3,303,484 | ￦ | 3,477,596 | ￦ | 3,568,456 | ||||||
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Depreciation |
2,756,131 | 2,762,773 | 2,745,969 | |||||||||
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Amortization of intangible assets |
582,467 | 582,493 | 618,533 | |||||||||
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Commissions |
1,036,852 | 1,099,429 | 1,085,865 | |||||||||
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Interconnection charges |
689,293 | 690,285 | 640,612 | |||||||||
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International interconnection fee |
231,060 | 216,633 | 214,058 | |||||||||
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Purchase of inventories |
3,963,036 | 3,407,263 | 4,053,693 | |||||||||
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Changes of inventories |
(198,028 | ) | 162,323 | (187,439 | ) | |||||||
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Sales commission |
1,856,595 | 1,968,035 | 2,201,778 | |||||||||
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Service cost |
1,163,887 | 1,322,337 | 1,428,405 | |||||||||
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Utilities |
319,303 | 323,406 | 323,313 | |||||||||
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Taxes and dues |
256,958 | 255,480 | 279,574 | |||||||||
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Rent |
469,950 | 455,457 | 448,772 | |||||||||
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Insurance premium |
211,104 | 178,231 | 69,384 | |||||||||
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Installation fee |
249,413 | 156,669 | 146,783 | |||||||||
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Advertising expenses |
177,348 | 185,560 | 197,114 | |||||||||
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Research and development expenses |
183,821 | 167,881 | 168,635 | |||||||||
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Card service cost |
2,959,765 | 3,049,559 | 3,094,894 | |||||||||
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Others |
1,410,349 | 1,319,688 | 1,379,438 | |||||||||
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Total |
￦ | 21,622,788 | ￦ | 21,781,098 | ￦ | 22,477,837 | ||||||
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Details of employee benefits for the years ended December 31, 2015, 2016 and 2017, are as follows:
| (In millions of Korean won) | 2015 | 2016 | 2017 | |||||||||
|
Short-term employee benefits |
￦ | 3,055,699 | ￦ | 3,206,904 | ￦ | 3,297,944 | ||||||
|
Post-employment benefits(Defined benefit plan) |
202,814 | 208,942 | 209,770 | |||||||||
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Post-employment benefits(Defined contribution plan) |
35,699 | 46,023 | 45,936 | |||||||||
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Post-employment benefits(Others) |
5,535 | 8,017 | 6,949 | |||||||||
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Share-based payment |
3,737 | 7,710 | 7,660 | |||||||||
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Total |
￦ | 3,303,484 | ￦ | 3,477,596 | ￦ | 3,568,259 | ||||||
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