645% is the change from 20 to 149
Calculation steps:
[( 149 - 20 ) ÷ 20] x 100 = 645%
Formula
Percentage change = [(149 - 20) / 20] x 100
Subtract the new number by the original number
149 - 20 = 129
129 ÷ 20 = 6.45
6.45 x 100 = 645%
Example