10400% is the change from 4 to 420
Calculation steps:
[( 420 - 4 ) ÷ 4] x 100 = 10400%
Formula
Percentage change = [(420 - 4) / 4] x 100
Subtract the new number by the original number
420 - 4 = 416
416 ÷ 4 = 104
104 x 100 = 10400%
Example