Question

at what rate per cent will a sum of ₹640 be compounded to ₹744.40 in two years.....
.
.
.
.
plz HELP!!!!!!

Answer 1

$\huge\bold{ANSWER--}$

Principle=640

Amount=774.40

Time=2yrs

Rate=?


Amount=p(1+r/100)^n


=774.40=640(1+r/100)^2

774.40÷640=(1+r/100)^2

(11/10)^2=(1+r/100)^2

11/10=1+r/100

11/10-1/1=r/100

1/10=r/100

R=100/10

R=10%. Answer


Therefore rate %=10%.