A sum becomes two fold in 6 yr at a certain rate of interest. Find the time, in which the same mount will be 10 fold at the same rate of interest.

Q: A sum becomes two fold in 6 yr at a certain rate of interest. Find the time, in which the same mount will be 10 fold at the same rate of interest.

Here, n = 2, m =10, T1 = 6 yr, T2 = ? ∴ T2 = [(m - 1) / (n - 1)] x T1 = [(10 - 1)/(2 - 1)] x 6 = 54 yr

35 yr
49 yr
59 yr
54 yr

Correct Answer: 54 yr

Explanation:

Here, n = 2, m =10, T₁ = 6 yr, T₂ = ?
∴ T₂ = [(m - 1) / (n - 1)] x T₁
= [(10 - 1)/(2 - 1)] x 6
= 54 yr

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