-50% is the change from 970 to 485
Calculation steps:
[( 485 - 970 ) ÷ 970] x 100 = -50%
Formula
Percentage change = [(485 - 970) / 970] x 100
Subtract the new number by the original number
485 - 970 = -485
-485 ÷ 970 = -0.5
-0.5 x 100 = -50%
Example