I've seen some of my "cost plus fee" government contracts I've worked on in the past; the fee (profit) was only around ~3.5%. Not saying this is a typical fee

I've seen some of my "cost plus fee" government contracts I've worked on in the past; the fee (profit) was only around ~3.5%. Not saying this is a typical fee on government contracts, but the company I was working for (big dollar government contractor) was happy with that.