69.45% is the change from 455 to 771
Calculation steps:
[( 771 - 455 ) ÷ 455] x 100 = 69.45%
Formula
Percentage change = [(771 - 455) / 455] x 100
Subtract the new number by the original number
771 - 455 = 316
316 ÷ 455 = 0.6945054945054945
0.6945054945054945 x 100 = 69.45%