-17.2% is the change from 930 to 770
Calculation steps:
[( 770 - 930 ) ÷ 930] x 100 = -17.2%
Formula
Percentage change = [(770 - 930) / 930] x 100
Subtract the new number by the original number
770 - 930 = -160
-160 ÷ 930 = -0.17204301075268819
-0.17204301075268819 x 100 = -17.2%