I would consider that salary as extra income for multiple earners in a household (You wouldn't be able to rent any decent place with that amount per day). Although the cost of living in Juarez is way way below than most places in the US, the cost of utilities in Juarez is unreasonably high. I couldn't find a lot of online resources to support this though. https://goo.gl/beC6LK

I grew up in Juarez and despite my parents making at least ten times that amount between the two of them, I would say we were only considered middle lower class for a household of four people.

The city has grown over the past 30 years considerably due to the manufacturing industry. https://en.wikipedia.org/wiki/Maquiladora

Most of the jobs provided by the maquiladora industry are low wage jobs such as this one that attract a lot of struggling families or individuals from other Mexican states. Some of my old friends still live in Juarez given that they work as industrial engineers and their salary ranges between $30,000 - $40,000 USD. Just enough to buy a 2-3 bedroom home in a decent area of town. This is a comparatively high salary for the region as well.