On 1st Jan. every year a person buys NSC of value exceeding that of his last year's purchase by Rs. 100 After10 years he finds that total value of certificates held by him is Rs 5000. Find the value of certificate purchased. (i)in the first year, and (ii) in the eight year.
Answer Explanation
Sol. Simply it is a question of sum of n terms
we have given,
5000 = 10/2 [2a +9.(100)]
1000 =2a +900
2a= 100 a = 50 Now , for (ii) part
A =8/2[2(50)+ 700] {from above}
a =4[100+700] =4[800] A= 3200 Rs.
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