Profit

1 "Profit from sales increased 10%."
2 "A profit from sales increased 10%."
3 "Profits from sales increased 10%."

4 "He doesn't expect profit in the next few years of starting a company."
5 "He doesn't expect a profit in the next few years of starting a company."
6 "He doesn't expect profits in the next few years of starting a company."

How to use "profit" and "profits"?