-35.71% is the change from 490 to 315
Calculation steps:
[( 315 - 490 ) ÷ 490] x 100 = -35.71%
Formula
Percentage change = [(315 - 490) / 490] x 100
Subtract the new number by the original number
315 - 490 = -175
-175 ÷ 490 = -0.35714285714285715
-0.35714285714285715 x 100 = -35.71%