-90% is the change from 60 to 6
Calculation steps:
[( 6 - 60 ) ÷ 60] x 100 = -90%
Formula
Percentage change = [(6 - 60) / 60] x 100
Subtract the new number by the original number
6 - 60 = -54
-54 ÷ 60 = -0.9
-0.9 x 100 = -90%
Example