-40.74% is the change from 81 to 48
Calculation steps:
[( 48 - 81 ) ÷ 81] x 100 = -40.74%
Formula
Percentage change = [(48 - 81) / 81] x 100
Subtract the new number by the original number
48 - 81 = -33
-33 ÷ 81 = -0.4074074074074074
-0.4074074074074074 x 100 = -40.74%