-98.07% is the change from 777 to 15
Calculation steps:
[( 15 - 777 ) ÷ 777] x 100 = -98.07%
Formula
Percentage change = [(15 - 777) / 777] x 100
Subtract the new number by the original number
15 - 777 = -762
-762 ÷ 777 = -0.9806949806949807
-0.9806949806949807 x 100 = -98.07%