99.05% is the change from 211 to 420
Calculation steps:
[( 420 - 211 ) ÷ 211] x 100 = 99.05%
Formula
Percentage change = [(420 - 211) / 211] x 100
Subtract the new number by the original number
420 - 211 = 209
209 ÷ 211 = 0.990521327014218
0.990521327014218 x 100 = 99.05%