computecross-sell opportunities by making difference between average & customer buys

Hello, i need help figuring out how i can compute the following:

average adjusted margin x section (righten table) - average adjusted margin x section (leften table)

so basically i need to compute the cross-sell opportunities by making the difference between the industry average and what the customer are buying.

the file is way too long to compute it by hand, the problem is that i'm not sure which formula i should use.

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