Question

A bank gives $10$% S.I. (Simple Interest) on deposits for senior citizens. Draw the graph of the relation between the sum deposited and the interest earned for one year.
Hence find
i) The interest on the deposit of $Rs.650$.
ii) The amount to be deposited to earn an interest of $Rs.45$.

Answer 1

for Simple Interest

$I=\frac{PTR}{100}$

given $T=$ $1$ year

$R=$ $10\%$

$I=\frac{P}{10}$

so the graph will be straight line passing through origin and slope $0.1$.

i) $I=\frac{P}{10}$

given $P=650$

so $I=65$

interest on deposit will be $Rs.65$

ii) $I=\frac{P}{10}$

given $I=45$

so $P=450$

amount to be deposited will be $Rs.450$