Hi
I have not forgotten you. Only my work prevented me from replying sooner.
I think the solution you are looking for can be found by finding the percentage of hours contributed to complete the types of work and the number of hours actually worked.
This can be calculated with
This productivity takes no account of the worker may be to complete the work "more hours". So there may be other measure establishing the maximum productivity of that worker. The formula which gives this value can be
or (better in my point of view)
See the file.
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