Hi there, I'm a bit lost how to resolve this problem. I know the answer, but not how to get there. Any help you could provide would be greatly appreciated.

Bill plans to open a do-it-yourself dog bathing center in a storefront. The bathing equipment will cost $160,000. Bill expects the after-tax cash inflows to be $40,000 annually for seven years, after which he plans to scrap the equipment and retire to the beaches of Jamaica.

Assume the required return is 10%. What is the project's NPV?