Penetration Testing costs

As a pentester how much would you charge to test :
- 3 web applications
- 1 Android app
- 1 iOS app
- Internal Network testing ( company has multiple locations however all on the same network )

I just want to get an idea of how I should charge I don't want to undersell myself or over do the quote. I was thinking along the lines of charging 20-30K ..is that reasonably competitive?

PS 1st contract bid I've …

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