1650% is the change from 24 to 420
Calculation steps:
[( 420 - 24 ) ÷ 24] x 100 = 1650%
Formula
Percentage change = [(420 - 24) / 24] x 100
Subtract the new number by the original number
420 - 24 = 396
396 ÷ 24 = 16.5
16.5 x 100 = 1650%
Example