121.05% is the change from 190 to 420
Calculation steps:
[( 420 - 190 ) ÷ 190] x 100 = 121.05%
Formula
Percentage change = [(420 - 190) / 190] x 100
Subtract the new number by the original number
420 - 190 = 230
230 ÷ 190 = 1.2105263157894737
1.2105263157894737 x 100 = 121.05%