54.21% is the change from 321 to 495
Calculation steps:
[( 495 - 321 ) ÷ 321] x 100 = 54.21%
Formula
Percentage change = [(495 - 321) / 321] x 100
Subtract the new number by the original number
495 - 321 = 174
174 ÷ 321 = 0.5420560747663551
0.5420560747663551 x 100 = 54.21%