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Question

Suresh started work in 1985 at an annual salary of Rs.5000 and received an increment of Rs.200 each year. After how many years did his income reach Rs.7000?

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Solution

It can be observed that suresh gets increment of Rs.200 every year
so d=200
Income in first year was 5000
So, a = 5000
After nthhis salary will be 7000
Therefore, an = a+(n1)d
7000 = 5000+(n1)(200)
70005000 = (n1)(200)
2000 = 200n200
2000+200 = 200n
n= 2200200
n=11
Therefore , in 11th year , his salary will reach Rs, 7000

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