-36.73% is the change from 490 to 310
Calculation steps:
[( 310 - 490 ) ÷ 490] x 100 = -36.73%
Formula
Percentage change = [(310 - 490) / 490] x 100
Subtract the new number by the original number
310 - 490 = -180
-180 ÷ 490 = -0.3673469387755102
-0.3673469387755102 x 100 = -36.73%