Need help. I cannot figure this out with any one of the three problems. Please explain the process.

Exercise 1-16 (Static) Computing net income using accounting equation LO P2 Shep Company's records show the following information for the current year. Determine net income (loss) for each of the following separate situations. Note: For all requirements, losses should be entered with a minus sign. a. Additional owner investments of $3,000 were contributed, and withdrawals of $7,000 were made during the current year. b. Additional owner investments of $15,000 were contributed, and no withdrawals were made during the current year. c. No additional owner investments were contributed, and withdrawals of $12,000 were made during the current year