100% is the change from 145 to 290
Calculation steps:
[( 290 - 145 ) ÷ 145] x 100 = 100%
Formula
Percentage change = [(290 - 145) / 145] x 100
Subtract the new number by the original number
290 - 145 = 145
145 ÷ 145 = 1
1 x 100 = 100%
Example