220% is the change from 20 to 64
Calculation steps:
[( 64 - 20 ) ÷ 20] x 100 = 220%
Formula
Percentage change = [(64 - 20) / 20] x 100
Subtract the new number by the original number
64 - 20 = 44
44 ÷ 20 = 2.2
2.2 x 100 = 220%
Example