139.88% is the change from 321 to 770
Calculation steps:
[( 770 - 321 ) ÷ 321] x 100 = 139.88%
Formula
Percentage change = [(770 - 321) / 321] x 100
Subtract the new number by the original number
770 - 321 = 449
449 ÷ 321 = 1.398753894080997
1.398753894080997 x 100 = 139.88%