-24.53% is the change from 848 to 640
Calculation steps:
[( 640 - 848 ) ÷ 848] x 100 = -24.53%
Formula
Percentage change = [(640 - 848) / 848] x 100
Subtract the new number by the original number
640 - 848 = -208
-208 ÷ 848 = -0.24528301886792453
-0.24528301886792453 x 100 = -24.53%