-1.64% is the change from 427 to 420
Calculation steps:
[( 420 - 427 ) ÷ 427] x 100 = -1.64%
Formula
Percentage change = [(420 - 427) / 427] x 100
Subtract the new number by the original number
420 - 427 = -7
-7 ÷ 427 = -0.01639344262295082
-0.01639344262295082 x 100 = -1.64%