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Question
Merry got a job with salary ₹ 15000 per month. If her salary increases by ₹ 100 per month, how much would be her salary after 20 months?
Solution
Merry’s monthly salaries form an A.P.
With first term (a) = ₹ 15000 and common difference (d) = ₹ 100
Number of months (n) = 20
tn = a + (n – 1)d
∴ t20 = 15000 + (20 – 1)(100)
= 15000 + 19(100)
= 15000 + 1900
= 16900
∴ Merry’s salary after 20 months will be ₹ 16,900.
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