20.79% is the change from 178 to 215
Calculation steps:
[( 215 - 178 ) ÷ 178] x 100 = 20.79%
Formula
Percentage change = [(215 - 178) / 178] x 100
Subtract the new number by the original number
215 - 178 = 37
37 ÷ 178 = 0.20786516853932585
0.20786516853932585 x 100 = 20.79%