What is the total number of students who opted for a job in Calcutta over the three years 1995, 1997 and 1999?
10800
1995 = 22% of 85% of 77% of 25000= 3600
1997= 21% of 95% of 76% of 27500= 4200
1999= 15% of 90% of 79% of 28200 = 3000
Total= 3600+4200+ 3000=10800