-45.44% is the change from 900 to 491
Calculation steps:
[( 491 - 900 ) ÷ 900] x 100 = -45.44%
Formula
Percentage change = [(491 - 900) / 900] x 100
Subtract the new number by the original number
491 - 900 = -409
-409 ÷ 900 = -0.45444444444444443
-0.45444444444444443 x 100 = -45.44%