-78.78% is the change from 839 to 178
Calculation steps:
[( 178 - 839 ) ÷ 839] x 100 = -78.78%
Formula
Percentage change = [(178 - 839) / 839] x 100
Subtract the new number by the original number
178 - 839 = -661
-661 ÷ 839 = -0.7878426698450537
-0.7878426698450537 x 100 = -78.78%