50% is the change from 214 to 321
Calculation steps:
[( 321 - 214 ) ÷ 214] x 100 = 50%
Formula
Percentage change = [(321 - 214) / 214] x 100
Subtract the new number by the original number
321 - 214 = 107
107 ÷ 214 = 0.5
0.5 x 100 = 50%
Example