640% is the change from 20 to 148
Calculation steps:
[( 148 - 20 ) ÷ 20] x 100 = 640%
Formula
Percentage change = [(148 - 20) / 20] x 100
Subtract the new number by the original number
148 - 20 = 128
128 ÷ 20 = 6.4
6.4 x 100 = 640%
Example