31.79% is the change from 173 to 228
Calculation steps:
[( 228 - 173 ) ÷ 173] x 100 = 31.79%
Formula
Percentage change = [(228 - 173) / 173] x 100
Subtract the new number by the original number
228 - 173 = 55
55 ÷ 173 = 0.3179190751445087
0.3179190751445087 x 100 = 31.79%