-63.01% is the change from 838 to 310
Calculation steps:
[( 310 - 838 ) ÷ 838] x 100 = -63.01%
Formula
Percentage change = [(310 - 838) / 838] x 100
Subtract the new number by the original number
310 - 838 = -528
-528 ÷ 838 = -0.630071599045346
-0.630071599045346 x 100 = -63.01%