-51.12% is the change from 491 to 240
Calculation steps:
[( 240 - 491 ) ÷ 491] x 100 = -51.12%
Formula
Percentage change = [(240 - 491) / 491] x 100
Subtract the new number by the original number
240 - 491 = -251
-251 ÷ 491 = -0.5112016293279023
-0.5112016293279023 x 100 = -51.12%