-91.45% is the change from 491 to 42
Calculation steps:
[( 42 - 491 ) ÷ 491] x 100 = -91.45%
Formula
Percentage change = [(42 - 491) / 491] x 100
Subtract the new number by the original number
42 - 491 = -449
-449 ÷ 491 = -0.9144602851323829
-0.9144602851323829 x 100 = -91.45%