Question

what sum of money will amount to rupees 708 in 3 years and rupees 780 in 5 years. find also the rate of interest.

Answer 1

Given

Amount after 3 yr =708

Amount after 5 yr=780

Two yr si=780-708=72

One yr si=72/2=36 ( because Si of every yr is same)

Principal =708-(36x3)

Principal =708-108

=₹600

P=600

AMOUNT =708

T=3yr

Si=A-P

=708-600=108


Si=pxrxt /100

R=SI X 100 / pxt

R=108x100/600x3

R=10800/1800

R=6%


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Answer 2

Answer:

h

Solution



Verified by Toppr

Correct option is

A

22426

Simple Interest is given by

I=100PNR

Where I = simple interest

            P = Principal

            N  = number of years

            R = rate of interest

Given, 

I=Rs.7008

N=6 years and 3 months  =6123=641=425 years 

R=5% 

Substituting the values in the formula:

 ⇒7008=100P×425×5

 ⇒7008=400P×125

 

 ⇒P=Rs.22425.60