The Coshocton Orchestra needs to purchase new sound boards before its upcoming summer park series. In the past, the Orchestra has always bought its equipment from Glass Music, a local vendor. Glass Music will offer the Orchestra a special deal of $12,000 for the sound equipment, plus $2500 a year for basic maintenance over the ten-year life of the boards. Zanesville Sound is trying to expand its regional customer base, and offers the Orchestra the sound boards for $18,000, plus $1500 a year for basic maintenance over the eight-year life of the equipment. The Orchestra uses a 7% cost of capital rate. From which company should the Coshocton Orchestra buy its sound equipment? Support your answer by showing all of your calculations.