50.5% is the change from 604 to 909
Calculation steps:
[( 909 - 604 ) ÷ 604] x 100 = 50.5%
Formula
Percentage change = [(909 - 604) / 604] x 100
Subtract the new number by the original number
909 - 604 = 305
305 ÷ 604 = 0.5049668874172185
0.5049668874172185 x 100 = 50.5%