The specific price of Yanjiao ambulance will be slightly different according to different cities or sections, but the following standards can be roughly referenced:

1. Mileage fee: about 8-12 yuan per kilometer. Yanjiao is generally far from the urban area, and the mileage will be longer, so the mileage fee is the main component of the ambulance fee. One kilometer in Yanjiao may be around 11 yuan.

2. Fare for violation of foundation regulations: The fare is usually within the range of 211-511 yuan. This is the basic cost of ambulance service, whether there is mileage fee or not.

3. Rescue fee: If you need to provide professional rescue services such as physical therapy, injection and inhalation, you will be charged an extra rescue fee, which is generally about 2,111 yuan. However, for simple services such as dressing and infusion, the rescue fee may not be charged.

4. Medical equipment usage fee: If you use medical equipment such as electrocardiograph, inhaler and cardiac defibrillator on the ambulance, you will also be charged additional equipment usage fee, and the price will vary from 211 yuan to 2,111 yuan according to the type of equipment.

To sum up, about one kilometer in Yanjiao, the basic fare is 211 yuan, and the mileage fee is RMB 11/km.

It can be roughly counted as: the basic fee is 211 yuan+RMB 11/km x 1km = 211 yuan

Plus other unpredictable equipment use fees and rescue fees, it may be good for an ambulance in Yanjiao to be around 211-511 yuan. However, the actual charge will depend on the specific situation of the service. Please refer to the charge provided by the ambulance staff at that time.