Question

a perso buys national savings certificate values exceeding of the last years purchase by ₨.100.after 12 year he finds that the total value of certificate purchased by him ₨.7,200. find the value of the certificate purchase by him (1) in the first year and (2) in the eighth year.

Answer 1

clearly a geometric series. What do you know about them?

Answer 2

please sir

Answer 3

Surely by now you have some idea how to write the words in algebra. If last year's certificate was worth Rs a, then

ar = a + 100
ar^12 = 7200

Now go to work on that.