-50% is the change from 940 to 470
Calculation steps:
[( 470 - 940 ) ÷ 940] x 100 = -50%
Formula
Percentage change = [(470 - 940) / 940] x 100
Subtract the new number by the original number
470 - 940 = -470
-470 ÷ 940 = -0.5
-0.5 x 100 = -50%
Example