-45% is the change from 840 to 462
Calculation steps:
[( 462 - 840 ) ÷ 840] x 100 = -45%
Formula
Percentage change = [(462 - 840) / 840] x 100
Subtract the new number by the original number
462 - 840 = -378
-378 ÷ 840 = -0.45
-0.45 x 100 = -45%
Example