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651 . Rs. 1,500 is invested at a rate of 10% simple interest and interest is added to the principal after every 5 years. In how many years will it amount to Rs. 2,500?
A. 6(1/9) years B. 6(1/4) years
C. 7 years D. None of these

652 . Sumit lent some money to Mohit at 5% per annum simple interest. Mohit lent the entire amount to Birju on the same day at 8(1/2)% per annum. In this transaction after a year Mohit earned a profit of Rs
A. Rs. 9,000 B. Rs. 10,000
C. Rs. 10,200 D. None of these

653 . Brinda borrowed Rs. 1,000 to build a hut. She pays 5% simple interest. She lets the hut to Ramu and receives the rent of Rs. 12(1/2) per month from Ramu. In how many years Brinda ought to clear off th
A. 10 years B. 10(1/4) years
C. 10(1/2) years D. None of these

654 . The rate of interest on a sum of money is 4% per annum for the first 2 years, 6% per annum for the next 4 years and 8% per annum for the period beyond 6 years. If the simple interest accrued by the su
A. Rs. 2,400 B. Rs. 2,200
C. Rs. 2,000 D. None of these

655 . Two equal sums of money were invested, one at 4% and the other at 4(1/2)%. At the end of 7 years, the simple interest received from the latter exceeded that received from the former by Rs. 31.50. Each
A. Rs. 1,000 B. Rs. 500
C. Rs. 750 D. Rs. 900