153.89% is the change from 321 to 815
Calculation steps:
[( 815 - 321 ) ÷ 321] x 100 = 153.89%
Formula
Percentage change = [(815 - 321) / 321] x 100
Subtract the new number by the original number
815 - 321 = 494
494 ÷ 321 = 1.5389408099688473
1.5389408099688473 x 100 = 153.89%