Question

at what rate will rupees 3000amount to rupees 3360 in 3 years

Answer 1

Considering simple interest

amount is 3360
principal is 3000
and time is 3 yrs.
rate is x%

then

3360 =3000*3*x/100

transposing

3360*100/3000*3=x

thus on basic arithmetic calculations we get

112/3=x

thus rate is 112/3% or 37.33%

Answer 2

si=ptr/100
SI=3360-3000
    =360
360=3000*2*x/100
36000=6000x
x=36000/6000
x=6
so the rate is 6%