-38.46% is the change from 39 to 24
Calculation steps:
[( 24 - 39 ) ÷ 39] x 100 = -38.46%
Formula
Percentage change = [(24 - 39) / 39] x 100
Subtract the new number by the original number
24 - 39 = -15
-15 ÷ 39 = -0.38461538461538464
-0.38461538461538464 x 100 = -38.46%