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Excel/conditional increments perpetually


I was wondering if there is a way to insert incremented conditions perpetually.

For example:
I'm trying to calculate how many hours it would take for a job.

For every 20 units, it takes me 30 minutes. My current formula reads:

I cannot go beyond this many nested formulas (excel warns and does not except the formula) but I have to be able to calculate working on much, much more than 140 units.

How can I increment with 30 minutes for every 20 units I work on in one formula?


I suggest the following...


This is an algebraic solution instead of using a series of IF functions.  This should work no matter what positive value you enter into G17.  

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