-42.87% is the change from 870 to 497
Calculation steps:
[( 497 - 870 ) ÷ 870] x 100 = -42.87%
Formula
Percentage change = [(497 - 870) / 870] x 100
Subtract the new number by the original number
497 - 870 = -373
-373 ÷ 870 = -0.42873563218390803
-0.42873563218390803 x 100 = -42.87%