Cost For A Freelance Software Developer? What Is The Market Rate?

I have been offered two software design projects. One will take about 4 months and the other one about 2-3 months. This includes coding, testing etc.
This I am doing for a friend.
How much should I charge my friend for these two projects. I don`t know how much does a freelance software developer charges. Should I charge per hour or in one lump sum?
What is the market rate? For both projects the cost is going to be different, of course.
Please help. I have to reply to my friend soon.

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