-97.5% is the change from 120 to 3
Calculation steps:
[( 3 - 120 ) ÷ 120] x 100 = -97.5%
Formula
Percentage change = [(3 - 120) / 120] x 100
Subtract the new number by the original number
3 - 120 = -117
-117 ÷ 120 = -0.975
-0.975 x 100 = -97.5%
Example