-60.34% is the change from 870 to 345
Calculation steps:
[( 345 - 870 ) ÷ 870] x 100 = -60.34%
Formula
Percentage change = [(345 - 870) / 870] x 100
Subtract the new number by the original number
345 - 870 = -525
-525 ÷ 870 = -0.603448275862069
-0.603448275862069 x 100 = -60.34%