107.1% is the change from 155 to 321
Calculation steps:
[( 321 - 155 ) ÷ 155] x 100 = 107.1%
Formula
Percentage change = [(321 - 155) / 155] x 100
Subtract the new number by the original number
321 - 155 = 166
166 ÷ 155 = 1.070967741935484
1.070967741935484 x 100 = 107.1%