-78.57% is the change from 378 to 81
Calculation steps:
[( 81 - 378 ) ÷ 378] x 100 = -78.57%
Formula
Percentage change = [(81 - 378) / 378] x 100
Subtract the new number by the original number
81 - 378 = -297
-297 ÷ 378 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%