Q5 of 25 Page 90

Sanjay gets fixed monthly income. Every year there is a certain increment in his salary. After 4 years, his monthly salary was Rs. 4500 and after 10 years his monthly salary became 5400 rupees, then find his original salary and yearly increment.

Let the original salary be 'x' and yearly increment be 'y'


After 4 years, his salary was Rs. 4500


⇒ x + 4y = 4500


⇒ x = 4500 - 4y eq.[1]


After 10 years, his salary becomes 5400


⇒ x + 10y = 5400


⇒ 4500 - 4y + 10y = 5400


⇒ 6y = 900


⇒ y = 150


Putting this in eq.[1],


⇒ x = 4500 - 4(150)


⇒ x = 4500 - 600 = 3900


Hence, his original salary was Rs. 3900 and increment per year was 150 Rs.


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