Question

Rohit purchases every year Bank's certificates
of value exceeding the last year's purchase by
25. Alter 20 years, he finds that the total value
of certificates purchased by him is 7250. Find
the value of the certificates purchased (i) in the
first year (ii) in the 13 year.​

Answer 1

Answer:

The given situation forms an AP

Let x be the first value.

Then AP will be x, x+25 , x+50 ..........

with a = x and c.d as +25.

Given,

S 20 = 7250

So, Applying formula

7250 = 20/2 ( 2x + 19 * 25)

725 = 2x +475

2x=250

x = 125

i.e Rs.125 in the first year

(ii)  To find a13

a13= a+12d

=125 + 12 * 25

=125 + 300

= 425

Explanation:

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