460% is the change from 75 to 420
Calculation steps:
[( 420 - 75 ) ÷ 75] x 100 = 460%
Formula
Percentage change = [(420 - 75) / 75] x 100
Subtract the new number by the original number
420 - 75 = 345
345 ÷ 75 = 4.6
4.6 x 100 = 460%
Example