Question

On a certain sum the internet paid after 3year us rs 450 at 5%rate of interest per annum find the sum

Answer 1

$simple \: interest = 450 \\ t = 3yr \\ r = 5\% \\ simple \: interest \: = p \times t \times r \times \frac{1}{100} \\ 450 = p \times 3 \times 5 \times \frac{1}{100} \\ 450 = p \times \frac{3}{20} \\ p = 450 \times \frac{20}{3} \\ p = 150 \times 20 \\ p = rs \: 3000$