Question

    A sum of 10,500 amounts to 13,825 in 3.8 years at a

    certain rate percent per annum simple interest. What will be the simple interest on the same sum for 5 years at double the earlier rate?
    A 8750.0 Correct Answer Incorrect Answer
    B 9187.5 Correct Answer Incorrect Answer
    C 9250.0 Correct Answer Incorrect Answer
    D 9387.5 Correct Answer Incorrect Answer

    Solution

    Given - P= 10500, A= 13825, R=r%, T=3.8years SI = A-P= 13825-10500=3325 SI= 3325 Now -SI = PRT/100 3325=10500×r×3.8/100 r= (3325×100)/1050×38 T= (133×20)/8×38   =35/4=8.75% so new simple interest for P= 10500, R= 2×8.75%, T= 5years then SI= (10500×2×8.75×5)100 =9187.5rs

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