-36.6% is the change from 642 to 407
Calculation steps:
[( 407 - 642 ) ÷ 642] x 100 = -36.6%
Formula
Percentage change = [(407 - 642) / 642] x 100
Subtract the new number by the original number
407 - 642 = -235
-235 ÷ 642 = -0.3660436137071651
-0.3660436137071651 x 100 = -36.6%