Question

a man saved rupees 200 during the first month rupess 225 in the second month and in this way he increseshis saving by rupees 25 every month find what time he saving will be rupess13325

Answer 1

After 43 years or 525 months.

Answer 2

Savings of the person are
200, 225, 250, 275 and so on....
Total savings = Sn = 13325 
$S_{n} = \frac{n}{2} [2a+(n-1)d]$
Here Sn = 13325, a = 200, d = 25

$13325 = \frac{n}{2} [2(200)+(n-1)25]$

$13325 = \frac{n}{2} [400+25n-25]$

26650 = 375 + 25n

25n = 26275

n = 1051

No. of months = 1051