145% is the change from 20 to 49
Calculation steps:
[( 49 - 20 ) ÷ 20] x 100 = 145%
Formula
Percentage change = [(49 - 20) / 20] x 100
Subtract the new number by the original number
49 - 20 = 29
29 ÷ 20 = 1.45
1.45 x 100 = 145%
Example