-49.03% is the change from 671 to 342
Calculation steps:
[( 342 - 671 ) ÷ 671] x 100 = -49.03%
Formula
Percentage change = [(342 - 671) / 671] x 100
Subtract the new number by the original number
342 - 671 = -329
-329 ÷ 671 = -0.4903129657228018
-0.4903129657228018 x 100 = -49.03%