A remotely situated fuel cell has an installed cost of $2000 and will reduce existing surveillance expenses by $400 per year for eight years. The salvage (market) value after eight years is $350. The border security agency's external investment rate is the same as its MARR at 10% per year. What is the ERR of the project? (Please keep two decimal places and exclude' 96' in your answer (e.g. if your answer is 18.45%, enter 18.45)