self Maths Puzzle

A man buys Bank's cash certificates every year for a value exceeding the last year's purchase by Rs 400. After 24 years, he finds that the total value of the certificate purchased by him is Rs 144,000. What is the value of the certificates purchased by him in the 13th year?

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self Other Question

In a green view apartment, the houses of a row are numbered consecutively from 1 to 49. Assuming that there is a value of 'x' such that the sum of the numbers of the houses preceding the house numbered 'x' is equal to the sum of the numbers of the houses following it. Then, what will be the value of 'x'?
On May 1, 2007, two organisations (A and B) were formed with n members each. On the first day of each subsequent month, m members join A while the number of members in B gets multiplied by p. On October 2, 2007, both organisations have the same number of members. If m = 20n, find p?