A building's projected annual utility costs are $150,000 annually. A premium curtain wall system is proposed by the glazing subcontractor that will reduce the overall utility consumption by 12% from the designed curtain wall. The estimate for the currently specified curtain wall is $725,000. The premium curtain wall is estimated to cost $950,000 initially. What is the annual costs savings of the premium curtain wall and how many years will it take to recoup the investment for the more expensive system?

A. $22,000, 6 years

B. $5,000, 15 years

C. $18,000, 7 years

D. $18,000, 12.5 years