-2% is the change from 501 to 491
Calculation steps:
[( 491 - 501 ) ÷ 501] x 100 = -2%
Formula
Percentage change = [(491 - 501) / 501] x 100
Subtract the new number by the original number
491 - 501 = -10
-10 ÷ 501 = -0.01996007984031936
-0.01996007984031936 x 100 = -2%