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646 . Prem invested a certain sum of money in a simple interest bond whose value grew to Rs. 300 at the end of 3 years and to Rs. 400 at the end of another 5 years. What was the rate of interest in which he
A. 12%
B. 12.5%
C. 6.67%
D. 8.33%

        647 . A sum was put at simple interest at a certain rate for 3 years. Had it been put at 1% higher rate, it would have fetched Rs. 5100 more. The sum is
        A. Rs. 170000 B. Rs. 150000
        C. Rs. 125000 D. Rs. 120000

        648 . A person invested some amount at the rate of 12% simple interest and a certain amount at the rate of 10% simple interest. He received yearly interest of Rs. 130. But if he had interchanged the amounts
        A. Rs. 700
        B. Rs. 500
        C. Rs. 800
        D. Rs. 400

            649 . A sum of Rs. 7700 is to be divided among three brothers Sunil, Sumant and Surat in such a way that simple interest on each part at 5% per annum after 1, 2 and 3 year respectively remains equal. The sh
            A. Rs. 2800 B. Rs. 2500
            C. Rs. 3000 D. Rs. 2700

            650 . If Rs. 1000 be invested at interest rate of 5% and the interest be added to the principal after 10 year, then the number of years in which it will amount to Rs. 2000 is
            A. 16(2/3) year B. 16(1/4) year
            C. 16 year D. 11 year