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Sum

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?

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#### Solution

Merry’s monthly salaries form an A.P.

With first term (a) = ₹ 15000 and common difference (d) = ₹ 100

Number of months (n) = 20

t_{n} = a + (n – 1)d

∴ t_{20} = 15000 + (20 – 1)(100)

= 15000 + 19(100)

= 15000 + 1900

= 16900

∴ Merry’s salary after 20 months will be ₹ 16,900.

Concept: Arithmetic Progression

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