4900% is the change from 18 to 900
Calculation steps:
[( 900 - 18 ) ÷ 18] x 100 = 4900%
Formula
Percentage change = [(900 - 18) / 18] x 100
Subtract the new number by the original number
900 - 18 = 882
882 ÷ 18 = 49
49 x 100 = 4900%
Example