The city of Oak Ridge is considering the construction of a four kilometer (km) greenway walking trail. It will cost $1,000 per km to build and $300 per km per year to maintain it over its 20-year life. If the city's MARR is 7% per year, what is the equivalent uniform annual cost of this project? Assume the trail has no residual value at the end of the 20 years. Please show your work.