Question

a sum when reckoned at 15/2%per annum amounts to Rs.3920 in 3 years. find sum.

Answer 1

A= 3920
T=3
R=15/2%
Let the P be 100
(100X3X15) /(100X2)= 22.5
A=(100+22.5)=122.5
If A=122.5, P=100
If A=3920, P=(100/122.5)X 3920
=3200
The principal is 3200

Answer 2

Answer:

Rs.3155.445

Step-by-step explanation:

Given : A sum when reckoned at 15/2%per annum amounts to Rs.3920 in 3 years.

To Find : find sum.

Solution :

Amount = Rs.3920

Rate of interest = 15/2%

Time = 3 years

Formula : $A=P(1+r)^t$

$3920=P(1+\frac{15}{200})^3$

$\frac{3920}{(1+\frac{15}{200})^3}=P$

$3155.445=P$

Hence the sum is Rs.3155.445