-79.34% is the change from 392 to 81
Calculation steps:
[( 81 - 392 ) ÷ 392] x 100 = -79.34%
Formula
Percentage change = [(81 - 392) / 392] x 100
Subtract the new number by the original number
81 - 392 = -311
-311 ÷ 392 = -0.7933673469387755
-0.7933673469387755 x 100 = -79.34%