154.21% is the change from 321 to 816
Calculation steps:
[( 816 - 321 ) ÷ 321] x 100 = 154.21%
Formula
Percentage change = [(816 - 321) / 321] x 100
Subtract the new number by the original number
816 - 321 = 495
495 ÷ 321 = 1.5420560747663552
1.5420560747663552 x 100 = 154.21%