-72.08% is the change from 770 to 215
Calculation steps:
[( 215 - 770 ) ÷ 770] x 100 = -72.08%
Formula
Percentage change = [(215 - 770) / 770] x 100
Subtract the new number by the original number
215 - 770 = -555
-555 ÷ 770 = -0.7207792207792207
-0.7207792207792207 x 100 = -72.08%