91.39% is the change from 209 to 400
Calculation steps:
[( 400 - 209 ) ÷ 209] x 100 = 91.39%
Formula
Percentage change = [(400 - 209) / 209] x 100
Subtract the new number by the original number
400 - 209 = 191
191 ÷ 209 = 0.9138755980861244
0.9138755980861244 x 100 = 91.39%