Question

A sum of rupees 1000 is deposited every year at 8% simple interest . calculate the interest at the end of each year . do these interest amounts from an a.p? if so,find the total interest at the end of 30 years

Answer 1

General term or nth term of A.P

The general term or nth term of A.P is given by an or tn = a + (n – 1)d, where a = a1 is the first term, d is the common difference and n is the number of term.

Sum of n terms of an AP

The sum of first n terms of an AP with first term 'a' and common difference 'd' is given by

Sn = n /2 [ 2a + ( n - 1) d] or

Sn=n /2 [ a + l ] (l = last term)

SOLUTION IS IN THE ATTACHMENT

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