28.5% is the change from 600 to 771
Calculation steps:
[( 771 - 600 ) ÷ 600] x 100 = 28.5%
Formula
Percentage change = [(771 - 600) / 600] x 100
Subtract the new number by the original number
771 - 600 = 171
171 ÷ 600 = 0.285
0.285 x 100 = 28.5%
Example