Help with investment decision questions 3-6

[markuswong]

View attachment 8986

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!

 

[Wilmer]

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 ?