5150% is the change from 8 to 420
Calculation steps:
[( 420 - 8 ) ÷ 8] x 100 = 5150%
Formula
Percentage change = [(420 - 8) / 8] x 100
Subtract the new number by the original number
420 - 8 = 412
412 ÷ 8 = 51.5
51.5 x 100 = 5150%
Example