Question 6 in level 1 model building exam

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Question 6 in level 1 model building exam

Could anyone who has finished the exam show me the formula for question 6? I failed 2 questions for this part.

I think I just need to refer the relevant numbers from another module and apply selections, and then it could be done. However, my way didn't work.

Here's my formulas. Thanks very much!

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