-54.03% is the change from 670 to 308
Calculation steps:
[( 308 - 670 ) ÷ 670] x 100 = -54.03%
Formula
Percentage change = [(308 - 670) / 670] x 100
Subtract the new number by the original number
308 - 670 = -362
-362 ÷ 670 = -0.5402985074626866
-0.5402985074626866 x 100 = -54.03%