-13% is the change from 977 to 850
Calculation steps:
[( 850 - 977 ) ÷ 977] x 100 = -13%
Formula
Percentage change = [(850 - 977) / 977] x 100
Subtract the new number by the original number
850 - 977 = -127
-127 ÷ 977 = -0.1299897645854657
-0.1299897645854657 x 100 = -13%