Question

A sum of money becomes 5/2 times of itself in 2 years at a certain rate of simple interest.the rate per annum is?

Answer 1

let the sum be x
amount5/2×x
$\frac{5x}{2} - x = simple \: intrest \\ \frac{5x - 2x}{2} \\ \frac{3x}{2}$
$si = \frac{prt}{100} \\ \frac{3x}{2} = \frac{x \times r \times 2}{100} \\ \frac{3x}{2 } = \frac{2x \times r}{100} \\ 300x = 4xr \\ r = \frac{300x}{4x} \\ r = 75\%$

Answer 2

Explanation:

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