-63.41% is the change from 123 to 45
Calculation steps:
[( 45 - 123 ) ÷ 123] x 100 = -63.41%
Formula
Percentage change = [(45 - 123) / 123] x 100
Subtract the new number by the original number
45 - 123 = -78
-78 ÷ 123 = -0.6341463414634146
-0.6341463414634146 x 100 = -63.41%