If implemented, how should Priya measure the return on investment of online training?

After 15 years of managing one of the leading sales departments, Priya Bandali was excited about her promotion to the position of learning and development manager for Elevated Software.
Elevated had over 300 salespeople and an overall workforce of 2000 employees working in 3 locations across Canada: Victoria, Regina, and Charlottetown. Although located in the head office in Regina, Priya had always been able to deploy new sales practices across the country to keep Elevated ahead of its competitors and felt her knowledge and experience would be valuable to her new position.