-6.87% is the change from 422 to 393
Calculation steps:
[( 393 - 422 ) ÷ 422] x 100 = -6.87%
Formula
Percentage change = [(393 - 422) / 422] x 100
Subtract the new number by the original number
393 - 422 = -29
-29 ÷ 422 = -0.06872037914691943
-0.06872037914691943 x 100 = -6.87%