Formula to calculate % Complete (numeric value) from Status (not started, in progress, complete)

I want to calculate the following and have tried IF/Then formulas - but get "unparceable" every time.

not started = 0%

in progress = 50%

complete = 100%

The columns I have (Task, Phase, Milestone, Start date, End Date, Responsible, Status, % Complete, Health, Notes.

The Health column auto-calculates based on the Status value


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