23.26% is the change from 172 to 212
Calculation steps:
[( 212 - 172 ) ÷ 172] x 100 = 23.26%
Formula
Percentage change = [(212 - 172) / 172] x 100
Subtract the new number by the original number
212 - 172 = 40
40 ÷ 172 = 0.23255813953488372
0.23255813953488372 x 100 = 23.26%