-36.99% is the change from 638 to 402
Calculation steps:
[( 402 - 638 ) ÷ 638] x 100 = -36.99%
Formula
Percentage change = [(402 - 638) / 638] x 100
Subtract the new number by the original number
402 - 638 = -236
-236 ÷ 638 = -0.36990595611285265
-0.36990595611285265 x 100 = -36.99%