Answer:
Amount after 3 years will be $22496
Step-by-step explanation:
We have given principal amount P = $20000
Rate of interest r = 4 %
Time period t = 3 years
We have to find the amount after 3 years
Amount is given by 
So 

So amount after 3 years will be $22496
(3+1)y=20
4y=20
both sides divided by four
y=5