-50% is the change from 606 to 303
Calculation steps:
[( 303 - 606 ) ÷ 606] x 100 = -50%
Formula
Percentage change = [(303 - 606) / 606] x 100
Subtract the new number by the original number
303 - 606 = -303
-303 ÷ 606 = -0.5
-0.5 x 100 = -50%
Example