112.5% is the change from 320 to 680
Calculation steps:
[( 680 - 320 ) ÷ 320] x 100 = 112.5%
Formula
Percentage change = [(680 - 320) / 320] x 100
Subtract the new number by the original number
680 - 320 = 360
360 ÷ 320 = 1.125
1.125 x 100 = 112.5%
Example