52.86% is the change from 210 to 321
Calculation steps:
[( 321 - 210 ) ÷ 210] x 100 = 52.86%
Formula
Percentage change = [(321 - 210) / 210] x 100
Subtract the new number by the original number
321 - 210 = 111
111 ÷ 210 = 0.5285714285714286
0.5285714285714286 x 100 = 52.86%