-42.38% is the change from 420 to 242
Calculation steps:
[( 242 - 420 ) ÷ 420] x 100 = -42.38%
Formula
Percentage change = [(242 - 420) / 420] x 100
Subtract the new number by the original number
242 - 420 = -178
-178 ÷ 420 = -0.4238095238095238
-0.4238095238095238 x 100 = -42.38%