-41.4% is the change from 831 to 487
Calculation steps:
[( 487 - 831 ) ÷ 831] x 100 = -41.4%
Formula
Percentage change = [(487 - 831) / 831] x 100
Subtract the new number by the original number
487 - 831 = -344
-344 ÷ 831 = -0.4139590854392298
-0.4139590854392298 x 100 = -41.4%