-91.03% is the change from 780 to 70
Calculation steps:
[( 70 - 780 ) ÷ 780] x 100 = -91.03%
Formula
Percentage change = [(70 - 780) / 780] x 100
Subtract the new number by the original number
70 - 780 = -710
-710 ÷ 780 = -0.9102564102564102
-0.9102564102564102 x 100 = -91.03%