Answer :

Given: The income of a person is ₹ 300, 000 in the first year

and he receives an increase of ₹ 10, 000 to his income per year for the next 19 years.

To find: the total amount he received in 20 years i.e. S20

According to question:

a = 300000, d = 10000 and n = 20

Formula used:

where a is first term, d is common difference and n is number of terms in an A.P.


S20 = 10(790000)

S20 = 7900000

Hence, the total amount he received at the end of 20 years is Rs. 790000

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