I hardly can wait to see your first attempt.
Acme Co. wants to build a new facility that requires an initial investment of $1 million and will reduce costs by $100,000 forever. The company has a total value of $600,000 and outstanding debt of $400,000. What is the NPV of this project if the company has an after tax cost of debt of 6% and a cost of equity of 9%?
Too bad. You used the magic words. If you truly have "no idea", you should not have been given this problem unless it is a placement exam. If you truly have "no idea" you have not read your book or attended class and need to have a nice chat with your academic advisor and remember to discuss whether or not you should be in this class.
Sorry. When you have an idea, we can talk.