-13.09% is the change from 978 to 850
Calculation steps:
[( 850 - 978 ) ÷ 978] x 100 = -13.09%
Formula
Percentage change = [(850 - 978) / 978] x 100
Subtract the new number by the original number
850 - 978 = -128
-128 ÷ 978 = -0.130879345603272
-0.130879345603272 x 100 = -13.09%