320% is the change from 5 to 21
Calculation steps:
[( 21 - 5 ) ÷ 5] x 100 = 320%
Formula
Percentage change = [(21 - 5) / 5] x 100
Subtract the new number by the original number
21 - 5 = 16
16 ÷ 5 = 3.2
3.2 x 100 = 320%
Example