78.78% is the change from 509 to 910
Calculation steps:
[( 910 - 509 ) ÷ 509] x 100 = 78.78%
Formula
Percentage change = [(910 - 509) / 509] x 100
Subtract the new number by the original number
910 - 509 = 401
401 ÷ 509 = 0.787819253438114
0.787819253438114 x 100 = 78.78%