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    Question

    A sum of money amounts to Rs 8400 in 3 years and Rs 9000

    in 4 years at simple interest. Find the principal and the rate of interest per annum.
    A Principal = Rs 5600; Rate = 11.09 % per annum. Correct Answer Incorrect Answer
    B Principal = Rs 7670; Rate = 29.09 % per annum. Correct Answer Incorrect Answer
    C Principal = Rs 1670; Rate = 33.09 % per annum. Correct Answer Incorrect Answer
    D Principal = Rs 6600; Rate = 9.09 % per annum. Correct Answer Incorrect Answer

    Solution

    Interest for the 4th year = 9000 βˆ’ 8400 = Rs 600. So, simple interest per year = Rs 600. In 3 years, total interest = 3 Γ— 600 = Rs 1800. Therefore principal = amount after 3 years βˆ’ interest = 8400 βˆ’ 1800 = Rs 6600. Rate of interest = (SI for 1 year / Principal) Γ— 100 = (600 / 6600) Γ— 100 = (60000 / 6600) = 600 / 66 = 100/11 % β‰ˆ 9.09% Answer: Principal = Rs 6600; Rate = 9.09Β % per annum.

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