exam Maths Puzzle Numerical Ability

Hi, i have some problem solving my Math assignment. Kindly help me to solve some of the problem and i need Solution and checkings. I really appreciate your help. Thank you!
1)Ther

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exam Other Question

1. If your revenue is $10 million, your variable cost is $6 million, your fixed cost is $3 million, what is your contribution margin?

2. A project has an initial outflow of $1
how do you simplify integers? for example(|1|)