-63.9% is the change from 277 to 100
Calculation steps:
[( 100 - 277 ) ÷ 277] x 100 = -63.9%
Formula
Percentage change = [(100 - 277) / 277] x 100
Subtract the new number by the original number
100 - 277 = -177
-177 ÷ 277 = -0.6389891696750902
-0.6389891696750902 x 100 = -63.9%