31.13% is the change from 212 to 278
Calculation steps:
[( 278 - 212 ) ÷ 212] x 100 = 31.13%
Formula
Percentage change = [(278 - 212) / 212] x 100
Subtract the new number by the original number
278 - 212 = 66
66 ÷ 212 = 0.3113207547169811
0.3113207547169811 x 100 = 31.13%