200% is the change from 140 to 420
Calculation steps:
[( 420 - 140 ) ÷ 140] x 100 = 200%
Formula
Percentage change = [(420 - 140) / 140] x 100
Subtract the new number by the original number
420 - 140 = 280
280 ÷ 140 = 2
2 x 100 = 200%
Example