Answers

2016-04-05T14:48:44+05:30
First year he gets 78000
second year he gets  78500
third year he gets 79000
and so on
His annual incomes are in arithmatic progression.
a = 78000
d = 500
n = 15
a₁₅ = a+(n-1)d
      = 78000 + 14(500)
      = 78000 + 7000
      = 85000
he gets 85000 as annual income after 15 years
he gets 13500 as monthly salary after 15 years

total amount he earns in 15 years = n/2 [ 2a + (n-1)d ]
total amount = 15/2 [156000 + 7000 ] 
total amount = 12,22,500 rs
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