51.4% is the change from 321 to 486
Calculation steps:
[( 486 - 321 ) ÷ 321] x 100 = 51.4%
Formula
Percentage change = [(486 - 321) / 321] x 100
Subtract the new number by the original number
486 - 321 = 165
165 ÷ 321 = 0.514018691588785
0.514018691588785 x 100 = 51.4%