-14.29% is the change from 490 to 420
Calculation steps:
[( 420 - 490 ) ÷ 490] x 100 = -14.29%
Formula
Percentage change = [(420 - 490) / 490] x 100
Subtract the new number by the original number
420 - 490 = -70
-70 ÷ 490 = -0.14285714285714285
-0.14285714285714285 x 100 = -14.29%