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Expenses by nature (Tables) | 12 Months Ended
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Dec. 31, 2021
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Summary of Expenses by Cost of Sales | Breakdown of expenses by nature for the years ended 31 December 2021, 2020 and 2019 is as follows: Cost of revenue: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Depreciation and amortization (*) |  | (7,291,913) |  | (5,974,779) |  | (5,046,565)
Cost of goods sold |  | (4,377,966) |  | (3,301,984) |  | (2,278,283)
Share of Turkish Treasury (Note 1) |  | (2,816,508) |  | (2,418,800) |  | (2,191,427)
Interconnection and termination expenses |  | (2,608,009) |  | (2,247,647) |  | (1,909,614)
Employee benefit expenses |  | (2,085,343) |  | (1,741,591) |  | (1,447,037)
Radio expenses |  | (1,258,037) |  | (921,153) |  | (734,583)
Frequency expenses |  | (1,032,410) |  | (887,243) |  | (802,950)
Transmission expenses |  | (565,820) |  | (426,036) |  | (335,980)
Universal service fund |  | (388,817) |  | (330,932) |  | (297,053)
Roaming expenses |  | (340,282) |  | (214,478) |  | (238,147)
Cost of revenue from financial services (**) |  | (223,050) |  | (135,237) |  | (240,297)
Others |  | (2,241,819) |  | (1,736,179) |  | (1,561,544)
​ |  | (25,229,974) |  | (20,336,059) | ​ | (17,083,480)
(*) As at 31 December 2021, depreciation and amortization expenses include depreciation and amortization expenses related to the financial services amounting to TL 66,798 (31 December 2020: TL 39,726; 31 December 2019: TL 26,478). (**) As at 31 December 2021, cost of revenue from financial services includes employee benefit expenses related to the financial services amounting to TL 31,722 (31 December 2020: TL 18,166; 31 December 2019: TL 11,358).
Summary of Expenses by Nature Selling and Marketing Expenses | Selling and marketing expenses: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Employee benefit expenses |  | (779,470) |  | (634,367) |  | (547,136)
Marketing expenses |  | (733,381) |  | (507,921) |  | (554,538)
Selling expenses |  | (163,974) |  | (173,064) |  | (349,269)
Others |  | (101,658) |  | (57,601) |  | (104,246)
​ |  | (1,778,483) |  | (1,372,953) | ​ | (1,555,189)
​
Summary of Expenses by Nature Administrative Expenses | Administrative expenses: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Employee benefit expenses |  | (617,850) |  | (479,932) |  | (473,843)
Consultancy expenses |  | (88,534) |  | (53,105) |  | (51,308)
Service expenses | ​ | (44,971) | ​ | (58,255) | ​ | (52,756)
Collection expenses |  | (38,224) |  | (52,189) |  | (57,097)
Maintenance and repair expenses |  | (27,419) |  | (20,139) |  | (26,610)
Travel and entertainment expenses |  | (17,938) |  | (17,009) |  | (34,644)
Other |  | (84,087) |  | (68,983) |  | (83,497)
​ |  | (919,023) |  | (749,612) | ​ | (779,755)
Summary of Net Impairment Losses on Financial and Contract Assets | Net impairment losses on financial and contract assets: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Net impairment losses on financial and contract assets |  | (271,162) |  | (349,595) |  | (338,857)
​ |  | (271,162) |  | (349,595) | ​ | (338,857)

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