56.52% is the change from 391 to 612
Calculation steps:
[( 612 - 391 ) ÷ 391] x 100 = 56.52%
Formula
Percentage change = [(612 - 391) / 391] x 100
Subtract the new number by the original number
612 - 391 = 221
221 ÷ 391 = 0.5652173913043478
0.5652173913043478 x 100 = 56.52%