-15.2% is the change from 908 to 770
Calculation steps:
[( 770 - 908 ) ÷ 908] x 100 = -15.2%
Formula
Percentage change = [(770 - 908) / 908] x 100
Subtract the new number by the original number
770 - 908 = -138
-138 ÷ 908 = -0.15198237885462554
-0.15198237885462554 x 100 = -15.2%