-65.31% is the change from 490 to 170
Calculation steps:
[( 170 - 490 ) ÷ 490] x 100 = -65.31%
Formula
Percentage change = [(170 - 490) / 490] x 100
Subtract the new number by the original number
170 - 490 = -320
-320 ÷ 490 = -0.6530612244897959
-0.6530612244897959 x 100 = -65.31%