Question
On a certain sum the simple interest for $$12\frac{1}{2}$$ year is $$\frac{3}{4}$$ of the sum. Then the rate of interest is = ?
Answer: Option B
$$\eqalign{
& {\text{Let sum = }}x \cr
& {\text{Interest = }}\frac{3}{4}x{\text{ }} \cr
& {\text{Interest = }}\frac{{{\text{PTR }}}}{{100}} \cr
& \Rightarrow \frac{3}{4}x = \frac{{x \times {\text{R}} \times 12.5}}{{100}} \cr
& {\text{R = 6}}\% \cr} $$
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$$\eqalign{
& {\text{Let sum = }}x \cr
& {\text{Interest = }}\frac{3}{4}x{\text{ }} \cr
& {\text{Interest = }}\frac{{{\text{PTR }}}}{{100}} \cr
& \Rightarrow \frac{3}{4}x = \frac{{x \times {\text{R}} \times 12.5}}{{100}} \cr
& {\text{R = 6}}\% \cr} $$
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