-50% is the change from 486 to 243
Calculation steps:
[( 243 - 486 ) ÷ 486] x 100 = -50%
Formula
Percentage change = [(243 - 486) / 486] x 100
Subtract the new number by the original number
243 - 486 = -243
-243 ÷ 486 = -0.5
-0.5 x 100 = -50%
Example