-49.64% is the change from 685 to 345
Calculation steps:
[( 345 - 685 ) ÷ 685] x 100 = -49.64%
Formula
Percentage change = [(345 - 685) / 685] x 100
Subtract the new number by the original number
345 - 685 = -340
-340 ÷ 685 = -0.49635036496350365
-0.49635036496350365 x 100 = -49.64%