-10.8% is the change from 870 to 776
Calculation steps:
[( 776 - 870 ) ÷ 870] x 100 = -10.8%
Formula
Percentage change = [(776 - 870) / 870] x 100
Subtract the new number by the original number
776 - 870 = -94
-94 ÷ 870 = -0.10804597701149425
-0.10804597701149425 x 100 = -10.8%