86.5% is the change from 311 to 580
Calculation steps:
[( 580 - 311 ) ÷ 311] x 100 = 86.5%
Formula
Percentage change = [(580 - 311) / 311] x 100
Subtract the new number by the original number
580 - 311 = 269
269 ÷ 311 = 0.864951768488746
0.864951768488746 x 100 = 86.5%