Subba Rao started work in 1995 at an annual salary of Rs. 5000 and received an increment of Rs. 200 each year. In which year did his salary reach Rs. 7000?
Initial salary of Subba Rao is Rs. 5000
That is first term (a) = 5000
He receives Rs.200 every year as increment
So, common difference (d) = 200
The year when he reaches Rs. 7000
So, an = 7000
an = a +(n-1)d
7000 = 5000 + (n-1) 200
2000 = 200(n-1)
10 = n-1
n = 11
So, it takes him 11 years to reach Rs. 7000