900% is the change from 60 to 600
Calculation steps:
[( 600 - 60 ) ÷ 60] x 100 = 900%
Formula
Percentage change = [(600 - 60) / 60] x 100
Subtract the new number by the original number
600 - 60 = 540
540 ÷ 60 = 9
9 x 100 = 900%
Example