100.96% is the change from 209 to 420
Calculation steps:
[( 420 - 209 ) ÷ 209] x 100 = 100.96%
Formula
Percentage change = [(420 - 209) / 209] x 100
Subtract the new number by the original number
420 - 209 = 211
211 ÷ 209 = 1.0095693779904307
1.0095693779904307 x 100 = 100.96%