-8.08% is the change from 421 to 387
Calculation steps:
[( 387 - 421 ) ÷ 421] x 100 = -8.08%
Formula
Percentage change = [(387 - 421) / 421] x 100
Subtract the new number by the original number
387 - 421 = -34
-34 ÷ 421 = -0.08076009501187649
-0.08076009501187649 x 100 = -8.08%