400% is the change from 4 to 20
Calculation steps:
[( 20 - 4 ) ÷ 4] x 100 = 400%
Formula
Percentage change = [(20 - 4) / 4] x 100
Subtract the new number by the original number
20 - 4 = 16
16 ÷ 4 = 4
4 x 100 = 400%
Example