At what simple rate of interest a sum is double in 8 years ?

(a) 11.0%
(b) 12.5%
(c) 12%
(d) 13.5%

Anurag Mishra Professor Asked on 10th February 2016 in Maths.
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    Answer: (b) 12.5%

    Let the rate be R% and principal be Rs. X

    Sum is double in 8 years,
    Then,  X = X x R x 8/100
    R = 100/8
    R = 25/2
    R = 12.5%

    Then, Rate of simple interest 12.5% a sum is doubled in 8 years.

    Hence, the correct answer is option (b) 12.5%

    Anurag Mishra Professor Answered on 11th February 2016.
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