50% is the change from 606 to 909
Calculation steps:
[( 909 - 606 ) ÷ 606] x 100 = 50%
Formula
Percentage change = [(909 - 606) / 606] x 100
Subtract the new number by the original number
909 - 606 = 303
303 ÷ 606 = 0.5
0.5 x 100 = 50%
Example