The workers are asking for the top band to increase by 5.3%, from 114 pesos to 120. They are currently making 163% of the minimum national wage of 70 pesos. I don't have any feel for how livable that is in Ciudad Júarez.
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.
Despite Mexico being cheaper than USA. About 50% cheaper I would say. $120 pesos A DAY (about $7.05 dollars) is an small amount to live with.
My interest is: "What is a lot in (that part of) Mexico?"
In Malawi, for example, $7/day would be life changing. Despite being American, I know far more about Africa and Europe and some parts of Asia than I do my own neighbors to the south and I would like to know more.
Exchange rates, which are the implicit basis of this article's concern, is a much worse metric than minimum wage.
I know you're asking if it's a lot for the workers, but the more relevant question is whether it's a lot to Lexmark, to which the answer is: it's thirty-five cents. So, no.