Question

a sum of 1780rs becomes 2136rs in 4years find the rate of interest and the sum that will become 810rs in 7years at the same rate of interest

Answer 1

Given in case - 1

P=1780
A=2136
T=4 yr

Si=A-P
=2136-1780=356

Si= P x R x T /100

$356 = \frac{1780 \times r \times 4}{100}$
R=
$\frac{356 \times 100}{1780 \times 4}$

R=5%

Now in case - 2 we will take the same rate of interest

A=810
T=7yr
R=5%

810-P= P x R x T /100

810-P=Px5x7/100

810-P=Px35/100

810-P=P0.35

810=P0.35+P

P=810/1.35
P=₹600

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