-74.94% is the change from 399 to 100
Calculation steps:
[( 100 - 399 ) ÷ 399] x 100 = -74.94%
Formula
Percentage change = [(100 - 399) / 399] x 100
Subtract the new number by the original number
100 - 399 = -299
-299 ÷ 399 = -0.7493734335839599
-0.7493734335839599 x 100 = -74.94%