-63.65% is the change from 839 to 305
Calculation steps:
[( 305 - 839 ) ÷ 839] x 100 = -63.65%
Formula
Percentage change = [(305 - 839) / 839] x 100
Subtract the new number by the original number
305 - 839 = -534
-534 ÷ 839 = -0.636471990464839
-0.636471990464839 x 100 = -63.65%