-49.5% is the change from 606 to 306
Calculation steps:
[( 306 - 606 ) ÷ 606] x 100 = -49.5%
Formula
Percentage change = [(306 - 606) / 606] x 100
Subtract the new number by the original number
306 - 606 = -300
-300 ÷ 606 = -0.49504950495049505
-0.49504950495049505 x 100 = -49.5%