| 29. | Other Operating Income and Expenses |
Details of other operating income andexpenses for the years ended December 31, 2017, 2016 and 2015 are as follows:
| (In millions of won) | ||||||||||||
| 2017 | 2016 | 2015 | ||||||||||
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Other Operating Income: |
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Gain on disposal of property and equipment and intangible assets |
13,991 | 6,908 | 7,140 | |||||||||
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Others(*) |
18,006 | 59,640 | 23,795 | |||||||||
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| ￦ | 31,997 | 66,548 | 30,935 | |||||||||
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Other Operating Expenses: |
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Communication |
￦ | 27,973 | 31,196 | 43,979 | ||||||||
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Utilities |
299,825 | 277,497 | 270,621 | |||||||||
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Taxes and dues |
27,819 | 35,020 | 36,118 | |||||||||
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Repair |
333,101 | 326,076 | 312,517 | |||||||||
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Research and development |
395,276 | 344,787 | 315,790 | |||||||||
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Training |
32,853 | 33,303 | 37,278 | |||||||||
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Bad debt for accounts receivable — trade |
34,584 | 37,820 | 60,450 | |||||||||
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Travel |
24,095 | 25,263 | 27,860 | |||||||||
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Supplies and other |
111,170 | 113,930 | 176,248 | |||||||||
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Loss on disposal of property and equipment and intangible assets |
60,086 | 63,797 | 21,392 | |||||||||
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Impairment loss on other investment securities |
9,003 | 24,033 | 42,966 | |||||||||
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Impairment loss on property and equipment and intangible assets |
54,946 | 24,506 | 35,845 | |||||||||
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Donations |
112,634 | 96,633 | 72,454 | |||||||||
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Bad debt for accounts receivable — other |
5,793 | 40,312 | 15,323 | |||||||||
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Others(*) |
101,589 | 49,593 | 55,536 | |||||||||
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| ￦ | 1,630,747 | 1,523,766 | 1,524,377 | |||||||||
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| (*) | See Note 5-(2). |