5900% is the change from 15 to 900
Calculation steps:
[( 900 - 15 ) ÷ 15] x 100 = 5900%
Formula
Percentage change = [(900 - 15) / 15] x 100
Subtract the new number by the original number
900 - 15 = 885
885 ÷ 15 = 59
59 x 100 = 5900%
Example