-42.79% is the change from 215 to 123
Calculation steps:
[( 123 - 215 ) ÷ 215] x 100 = -42.79%
Formula
Percentage change = [(123 - 215) / 215] x 100
Subtract the new number by the original number
123 - 215 = -92
-92 ÷ 215 = -0.42790697674418604
-0.42790697674418604 x 100 = -42.79%