-12.86% is the change from 770 to 671
Calculation steps:
[( 671 - 770 ) ÷ 770] x 100 = -12.86%
Formula
Percentage change = [(671 - 770) / 770] x 100
Subtract the new number by the original number
671 - 770 = -99
-99 ÷ 770 = -0.12857142857142856
-0.12857142857142856 x 100 = -12.86%