200% is the change from 320 to 960
Calculation steps:
[( 960 - 320 ) ÷ 320] x 100 = 200%
Formula
Percentage change = [(960 - 320) / 320] x 100
Subtract the new number by the original number
960 - 320 = 640
640 ÷ 320 = 2
2 x 100 = 200%
Example