A store has three branches. Branch 1 has 10 employees with a mean salary of \40,000.Branch2has15employeeswithameansalaryof$50,000.Branch3hasN_3employeeswithameansalaryof$60,000.Ifthecombinedmeansalaryofallthreebranchesis$51,250,whatisthenumberofemployeesN_3$ in Branch 3?