Question

If the sum of interest on rs850 for 3years and rs1250 for 4years at the same rate of interest is rs302 find the percentage of si per annum

Answer 1

$\textbf{To find:}$

$\text{Rate of interest}$

$\textbf{Solution:}$

$\textbf{Simple interest formula:}$

$\text{Simple interest=}\dfrac{P\,n\,r}{100}$

$\text{As per given data,}$

$\dfrac{850{\times}3{\times}r}{100}+\dfrac{1250{\times}4{\times}r}{100}=302$

$\dfrac{2550r}{100}+\dfrac{5000r}{100}=302$

$\dfrac{7550r}{100}=302$

$\dfrac{755r}{10}=302$

$\dfrac{151r}{2}=302$

$\dfrac{r}{2}=2$

$\implies\;r=4\,\%$

$\therefore\textbf{The rate of interest is \bf\,4\,\% }$

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Answer 2

Step-by-step explanation:

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