90.48% is the change from 210 to 400
Calculation steps:
[( 400 - 210 ) ÷ 210] x 100 = 90.48%
Formula
Percentage change = [(400 - 210) / 210] x 100
Subtract the new number by the original number
400 - 210 = 190
190 ÷ 210 = 0.9047619047619048
0.9047619047619048 x 100 = 90.48%