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    Question

    A person 'P' invested Rs. 800 for

    2 years at an interest rate of 'a'% per annum, Rs. 450 for 4 years at an interest rate of (a - 2)% per annum, and Rs. 1200 for 5 years at an interest rate of 5% per annum. The total simple interest earned was Rs. 604. Determine the value of 'a'.
    A 12 Correct Answer Incorrect Answer
    B 10 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ, 800 ร— 2 ร— a% + 450 ร— 4 ร— (a - 2)% + 1200 ร— 5 ร— 5% = 604 16a + 18a โ€“ 36 + 300 = 604 34a + 264 = 604 34a = 340 a = 10ย 

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