Accounting Homework?

Percentage of completion in accounting?
Ok, I have calculated the percentage of completion and revenue. How would I get expense and net income from this information.

For example:
2005 cash collections 30 million cost incurred 15 million contract price is 120 million.

I calculated the following as:
2005 15 million/85 million = 18% of completion 18% X 120 million = 21.6 million in revenue
21.6 million – 15million 6.6 million gross profit

What do they mean by calculate expense and net income?

Thanks