What is the average of the monthly salary of Sumit in the year 2008, Anil in the year 2009 and Jyoti in the year 2010?
Rs. 20,000
Monthly salary of Sumit in year 2008 = 15000
Monthly salary of Anil in year 2009 = 15000
Monthly salary of Jyoti in year 2010 = 30000
Average monthly salary = 600003=20000