-68.85% is the change from 321 to 100
Calculation steps:
[( 100 - 321 ) ÷ 321] x 100 = -68.85%
Formula
Percentage change = [(100 - 321) / 321] x 100
Subtract the new number by the original number
100 - 321 = -221
-221 ÷ 321 = -0.6884735202492211
-0.6884735202492211 x 100 = -68.85%