159.69% is the change from 320 to 831
Calculation steps:
[( 831 - 320 ) ÷ 320] x 100 = 159.69%
Formula
Percentage change = [(831 - 320) / 320] x 100
Subtract the new number by the original number
831 - 320 = 511
511 ÷ 320 = 1.596875
1.596875 x 100 = 159.69%