64.31% is the change from 311 to 511
Calculation steps:
[( 511 - 311 ) ÷ 311] x 100 = 64.31%
Formula
Percentage change = [(511 - 311) / 311] x 100
Subtract the new number by the original number
511 - 311 = 200
200 ÷ 311 = 0.6430868167202572
0.6430868167202572 x 100 = 64.31%