-78.57% is the change from 392 to 84
Calculation steps:
[( 84 - 392 ) ÷ 392] x 100 = -78.57%
Formula
Percentage change = [(84 - 392) / 392] x 100
Subtract the new number by the original number
84 - 392 = -308
-308 ÷ 392 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%