77.8% is the change from 455 to 809
Calculation steps:
[( 809 - 455 ) ÷ 455] x 100 = 77.8%
Formula
Percentage change = [(809 - 455) / 455] x 100
Subtract the new number by the original number
809 - 455 = 354
354 ÷ 455 = 0.778021978021978
0.778021978021978 x 100 = 77.8%