69.23% is the change from 455 to 770
Calculation steps:
[( 770 - 455 ) ÷ 455] x 100 = 69.23%
Formula
Percentage change = [(770 - 455) / 455] x 100
Subtract the new number by the original number
770 - 455 = 315
315 ÷ 455 = 0.6923076923076923
0.6923076923076923 x 100 = 69.23%