-82.99% is the change from 770 to 131
Calculation steps:
[( 131 - 770 ) ÷ 770] x 100 = -82.99%
Formula
Percentage change = [(131 - 770) / 770] x 100
Subtract the new number by the original number
131 - 770 = -639
-639 ÷ 770 = -0.8298701298701299
-0.8298701298701299 x 100 = -82.99%