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(D) The formula for compound interest is $A = P(1 + \frac{R}{100})^T$,where $A$ is the final amount,$P$ is the principal,$R$ is the rate of interest,a

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$20$

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(D) The formula for compound interest is $A = P(1 + \frac{R}{100})^T$,where $A$ is the final amount,$P$ is the principal,$R$ is the rate of interest,and $T$ is the time in years.Given that the amount becomes $1.44$ times the principal in $2$ years,we have $A = 1.44P$ and $T = 2$.Substituting these values into the formula:$1.44P = P(1 + \frac{R}{100})^2$Dividing both sides by $P$:$1.44 = (1 + \frac{R}{100})^2$Taking the square root of both sides:$\sqrt{1.44} = 1 + \frac{R}{100}$$1.2 = 1 + \frac{R}{100}$Subtracting $1$ from both sides:$0.2 = \frac{R}{100}$$R = 0.2 	imes 100 = 20 \%$Thus,the rate of interest is $20 \%$ per annum.

If a sum of money compounded annually becomes $1.44$ times of itself in $2$ years,then the rate of interest per annum (in $\%$) is:

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