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v3.20.1

Accounts payable and accrued expenses: | 12 Months Ended
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Dec. 31, 2019
Accounts payable and accrued expenses: |
Accounts payable and accrued expenses: | Note 10 - Accounts payable and accrued expenses: At December 31, 2018 and 2019, the balances are as follows:
|  |  | December 31,
|  | 2018 |  | 2019
Suppliers |  | Ps. | 313,574 |  | Ps. | 245,100
Taxes payable |  |  | 230,196 |  |  | 175,573
Use rights of assets under concession |  |  | 247,729 |  |  | 269,916
Accounts payable to related parties (Note 15.1) |  |  | 97,332 |  |  | 97,312
Lease payable (Note 7.1) |  |  |  |  |  | 20,422
Salaries payable |  |  | 127,289 |  |  | 149,452
Sundry creditors for services provided |  |  | 810,973 |  |  | 803,746
Accounts payable to contractors |  |  | 44,331 |  |  | 37,809
Total |  | Ps. | 1,871,424 |  | Ps. | 1,799,330
Due to the fact that these accounts mature at a term of under one year, their fair value is considered to approximate their book value.

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