-77.12% is the change from 839 to 192
Calculation steps:
[( 192 - 839 ) ÷ 839] x 100 = -77.12%
Formula
Percentage change = [(192 - 839) / 839] x 100
Subtract the new number by the original number
192 - 839 = -647
-647 ÷ 839 = -0.7711561382598331
-0.7711561382598331 x 100 = -77.12%