17.42% is the change from 178 to 209
Calculation steps:
[( 209 - 178 ) ÷ 178] x 100 = 17.42%
Formula
Percentage change = [(209 - 178) / 178] x 100
Subtract the new number by the original number
209 - 178 = 31
31 ÷ 178 = 0.17415730337078653
0.17415730337078653 x 100 = 17.42%