Question

find the compound interest at the rate of 5% per annum for 2 years on that principle which in two years at the same rate gives 800 as simple interest

Answer 1

Si=Rs,800
R=5%p.a.
T=2yrs
we know that p×r×t/100=si
p×5×2/100=Rs.800
So,P=Rs.8000
And A=Rs.8000 (1+5/100)^2=Rs.8820
So,CI=A-P=Rs.(8820-8000)=Rs.820

Answer 2

Si=p*t*r/100
800 =p*5*2/100
P=800*100/5*2
P=8000


CI =8000(1+5/100)²-8000
=(8000*1.1025)-8000
=8820-8000
=820