66.38% is the change from 235 to 391
Calculation steps:
[( 391 - 235 ) ÷ 235] x 100 = 66.38%
Formula
Percentage change = [(391 - 235) / 235] x 100
Subtract the new number by the original number
391 - 235 = 156
156 ÷ 235 = 0.6638297872340425
0.6638297872340425 x 100 = 66.38%