140.63% is the change from 320 to 770
Calculation steps:
[( 770 - 320 ) ÷ 320] x 100 = 140.63%
Formula
Percentage change = [(770 - 320) / 320] x 100
Subtract the new number by the original number
770 - 320 = 450
450 ÷ 320 = 1.40625
1.40625 x 100 = 140.63%