154.69% is the change from 320 to 815
Calculation steps:
[( 815 - 320 ) ÷ 320] x 100 = 154.69%
Formula
Percentage change = [(815 - 320) / 320] x 100
Subtract the new number by the original number
815 - 320 = 495
495 ÷ 320 = 1.546875
1.546875 x 100 = 154.69%