83.28% is the change from 311 to 570
Calculation steps:
[( 570 - 311 ) ÷ 311] x 100 = 83.28%
Formula
Percentage change = [(570 - 311) / 311] x 100
Subtract the new number by the original number
570 - 311 = 259
259 ÷ 311 = 0.8327974276527331
0.8327974276527331 x 100 = 83.28%