61.09% is the change from 311 to 501
Calculation steps:
[( 501 - 311 ) ÷ 311] x 100 = 61.09%
Formula
Percentage change = [(501 - 311) / 311] x 100
Subtract the new number by the original number
501 - 311 = 190
190 ÷ 311 = 0.6109324758842444
0.6109324758842444 x 100 = 61.09%