-46.57% is the change from 642 to 343
Calculation steps:
[( 343 - 642 ) ÷ 642] x 100 = -46.57%
Formula
Percentage change = [(343 - 642) / 642] x 100
Subtract the new number by the original number
343 - 642 = -299
-299 ÷ 642 = -0.4657320872274143
-0.4657320872274143 x 100 = -46.57%