64.89% is the change from 601 to 991
Calculation steps:
[( 991 - 601 ) ÷ 601] x 100 = 64.89%
Formula
Percentage change = [(991 - 601) / 601] x 100
Subtract the new number by the original number
991 - 601 = 390
390 ÷ 601 = 0.64891846921797
0.64891846921797 x 100 = 64.89%