-98.07% is the change from 778 to 15
Calculation steps:
[( 15 - 778 ) ÷ 778] x 100 = -98.07%
Formula
Percentage change = [(15 - 778) / 778] x 100
Subtract the new number by the original number
15 - 778 = -763
-763 ÷ 778 = -0.980719794344473
-0.980719794344473 x 100 = -98.07%