51.42% is the change from 212 to 321
Calculation steps:
[( 321 - 212 ) ÷ 212] x 100 = 51.42%
Formula
Percentage change = [(321 - 212) / 212] x 100
Subtract the new number by the original number
321 - 212 = 109
109 ÷ 212 = 0.5141509433962265
0.5141509433962265 x 100 = 51.42%