-18.81% is the change from 420 to 341
Calculation steps:
[( 341 - 420 ) ÷ 420] x 100 = -18.81%
Formula
Percentage change = [(341 - 420) / 420] x 100
Subtract the new number by the original number
341 - 420 = -79
-79 ÷ 420 = -0.1880952380952381
-0.1880952380952381 x 100 = -18.81%