-36.94% is the change from 490 to 309
Calculation steps:
[( 309 - 490 ) ÷ 490] x 100 = -36.94%
Formula
Percentage change = [(309 - 490) / 490] x 100
Subtract the new number by the original number
309 - 490 = -181
-181 ÷ 490 = -0.3693877551020408
-0.3693877551020408 x 100 = -36.94%