99.53% is the change from 211 to 421
Calculation steps:
[( 421 - 211 ) ÷ 211] x 100 = 99.53%
Formula
Percentage change = [(421 - 211) / 211] x 100
Subtract the new number by the original number
421 - 211 = 210
210 ÷ 211 = 0.995260663507109
0.995260663507109 x 100 = 99.53%