MHB Investment Decisions: Help w/ Questions 3-6 Needed

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So far, I have $50,000 for question 1 and 17.27% for question 2. Can someone please help me with question 3 to 6? Thank you!
 

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You are using nice round amounts:
expenses 125,000
revenue 200,000 and 300,000
sell for 400,000

...But start off with purchase of 510,074.04 !

Why is purchase such a silly amount ?
 

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