101.25% is the change from 321 to 646
Calculation steps:
[( 646 - 321 ) ÷ 321] x 100 = 101.25%
Formula
Percentage change = [(646 - 321) / 321] x 100
Subtract the new number by the original number
646 - 321 = 325
325 ÷ 321 = 1.0124610591900312
1.0124610591900312 x 100 = 101.25%