64.38% is the change from 393 to 646
Calculation steps:
[( 646 - 393 ) ÷ 393] x 100 = 64.38%
Formula
Percentage change = [(646 - 393) / 393] x 100
Subtract the new number by the original number
646 - 393 = 253
253 ÷ 393 = 0.6437659033078881
0.6437659033078881 x 100 = 64.38%