What is the hour of a mobile developer's time in the Russian-speaking market (freelance / firms)?

Question

Freelance

Tell me:
1. What is the average price per hour of a mobile developer's time in the Russian-speaking market? Interested in freelancing / companies, Android / iOS (native) and hybrids (ionic, react native, etc.).
I just observed situations when a news application (feed and a couple of pages) on iOS for 4 million rubles. ordered, as well as for 100 thousand rubles. a Facebook-like project (I'm exaggerating) was done on both platforms.
2. Does the hourly price vary depending on the complexity/size of the project?
3.A different price for each customer (depending on his behavior / activities / company) - is it a normal practice?
4. How to correctly calculate the fix. the cost of a large project? In case the customer asks for additional functionality (even minor ones), or edits during the project (which are not in the specification, but are impatient). - Calculate with a margin?
5. Regarding the portfolio: do you need a site with cases, or is it easier to indicate links in the responses? and who thinks what is needed, then on behalf of the studio or on their own?

Answer 1

I just observed situations when a news application (feed and a couple of pages) on iOS for 4 million rubles. ordered, as well as for 100 thousand rubles. a Facebook-like project (I'm exaggerating) was done on both platforms.

Your nephew will draw a square for candy, and Tema Lebedev will draw him for 100k.
It seems to me that it is impossible to give a definite answer. Look at the portfolio, the speed of work and the appetites of programmers. It is easy for two +- identical developers to have a different rate only because one lives in Muhosran, and the second in Moscow, and they have different requests.