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Maths Puzzle
Numerical Ability
Simple & Compound Interest
A certain sum of money at simple interest becomes Rs. 1062 in 2 years and Rs. 1183.50 in 31⁄2
years. What is rate of interest per annum?
Op 1: 7%
Op 2: 6%
Op 3: 9%
Op 4: 5% what will be it's answer
Read Solution (Total 2)
-
- A2=1062
A3.5=1183.5
NOW,S.I(1.5 YEARS)=1183.5-1062=121.5
THEN using unitary method,,, SI FOR(2yrs)=121.5*2/3.5
=162.
now amount=P+I....SO PRINCIPAL=1062-162=900
=>900*R*2/100 =162.
R=9% pa. - 6 years agoHelpfull: Yes(3) No(3)
- 3) 9%
Let the sum=Rs x and rate%= r, then
Sum after 2 years = x + x*r*2/100 = 1062 ----(i) and
Sum after 3 1/2 or 7/2 years = x + x*r*(7/2)/100 = 1183.5 ----(ii)
Subtracting (i) from (ii), 7xr/200 - 2xr/100 = 121.5
=> 3xr = 24300 or xr=8100
Substituting value of xr=8100 in (i), x + 8100*2/100 = 1062 => x = 1062 - 162 = 900
So r= 8100/900= 9 - 8 years agoHelpfull: Yes(0) No(1)
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