80.55% is the change from 509 to 919
Calculation steps:
[( 919 - 509 ) ÷ 509] x 100 = 80.55%
Formula
Percentage change = [(919 - 509) / 509] x 100
Subtract the new number by the original number
919 - 509 = 410
410 ÷ 509 = 0.8055009823182712
0.8055009823182712 x 100 = 80.55%