Question

P=2000
R=20
SI=8000
Find the time.

Answer 1

SI  = PTR
         100

SI = 8000
R = 20
P = 2000

----------------------------------
8000 = 2000 X 20 X T
                  100

800000 = 40000 T

T = 20 
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THEREFORE TIME = 20

Answer 2

We know,

Simple interest = Principal × Rate of interest ×Time/100

SI= PRT/100

Now,

8000= 2000×20×T/100

or,8000= 40000T/100

or,800000=40000T

or,T = 800000/ 40000

or,T = 20

So,the time is 20

Hope it helps