Please help with the using of the ERR method not the IRR, thank you

Your company is considering a project which requires a $30,000 initial investment with a predicted salvage value at the end of its six year useful life of $8,000. You expect an annual return of $6,000 for the six year study period. Additionally, the equipment will require an overhaul costing $1,000 at the end of the third year. Evaluate the project using the IRR method and a MARR of 8.5%. For the project described in problem 2, use the ERR method to evaluate the project