Question

At what rate percent per annum will Rs 360 amount to Rs 450 in 5 year ​

Answer 1

Answer:

$\huge\blue{\sf {\boxed{ \sf{{note \ \: : }}}}}$

$\sf \: s.i \: = \: \frac{p \times r \times t}{100}$

$\to\sf \: s.i \: = \: \frac{p r t}{100}$

$\sf \: p \ \: : principle$

$\sf r\ \: : rate \: of \: intrest \: (\%)$

$\sf \: t \ \: : time \: (years)$

$\sf \huge \underline{solution \ \: : }$

$\bf \underline{let \: the \: rate \: of \: intrest \: be \: (r)}$

$\sf \to \frac{360 \times r \times 5}{100} = 450$

$\sf \to360 \times r \times 5 = 45 \times (100)$

$\sf \to \: 1800 \times r = 4500$

$\sf \to \: r = \frac{4500}{1800}$

$\sf \to \: r = \frac{45}{18}$

$\sf \to \: r = \frac{9}{2}$

$\purple{ \fbox{ \fbox{r \: = \: 4.5\%}}}$

• Therefore the rate of intrest is (4.5%)

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