I think it's great that you're helping your son with some homework, but it's a lot to really ask here for help.
It's like cheating for an exam
I had to think about which formulas to use and how to use them and did come up with an idea and I think the solution.
I'll give you the three formulas I used, one for each column, E, F and one for G; this way its not all doen by one us and your son can complete it.
I'm sure others will have other ideas but I liked this one and ... I think the result is what you needed:
Formula for D 2
The iedea is that IFEEROR function when correct returns the result, when not it gives a 0 and that I dit for the three named ragnes in one formula, so one will alwyas return the correct answer and that is why I added the result, one will be a correct number and the other two will be 0
Formula for F 2
The same principle
Formula for G 2
And the final result(proof of result)
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