Draft a letter of inquiry to the Proprietor, High Tech Electronics, Sadar Bazaar, Gurgaon asking him if his outlet can supply you with four two tonnes split air conditioners for the newly constructed science lab focused on research and development of Artificial Intelligence Also, ask him about the best options available and the best possible discount that can be offered. Also ask him about the maintenance schedules, rates and frequency. You are Mr Sarthak Kumar, the Principal of North Star Public School, Sector 14, Gurgaon.