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. Find the total amount, he received in 20 years.
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.
Therefore,
⇒ S20 = 10(790000)
⇒ S20 = 7900000
Hence, the total amount he received at the end of 20 years is Rs. 790000