If the amount is $3\frac{3}{8}$ time the sum after $3$ years at compound Interest compounded annually, then the rate of Interest per annum is

A = P ($1+\frac{R^{T}}{100}$)

$\frac{27}{8}$X = X ($1+\frac{R^{3}}{100}$)

($1+\frac{R^{}}{100}$)= $\frac{3}{2}$

$R= \frac{1}{2}\times100$

R = 50%

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