-49.76% is the change from 613 to 308
Calculation steps:
[( 308 - 613 ) ÷ 613] x 100 = -49.76%
Formula
Percentage change = [(308 - 613) / 613] x 100
Subtract the new number by the original number
308 - 613 = -305
-305 ÷ 613 = -0.49755301794453505
-0.49755301794453505 x 100 = -49.76%