110% is the change from 200 to 420
Calculation steps:
[( 420 - 200 ) ÷ 200] x 100 = 110%
Formula
Percentage change = [(420 - 200) / 200] x 100
Subtract the new number by the original number
420 - 200 = 220
220 ÷ 200 = 1.1
1.1 x 100 = 110%
Example