77.88% is the change from 321 to 571
Calculation steps:
[( 571 - 321 ) ÷ 321] x 100 = 77.88%
Formula
Percentage change = [(571 - 321) / 321] x 100
Subtract the new number by the original number
571 - 321 = 250
250 ÷ 321 = 0.778816199376947
0.778816199376947 x 100 = 77.88%