-50% is the change from 902 to 451
Calculation steps:
[( 451 - 902 ) ÷ 902] x 100 = -50%
Formula
Percentage change = [(451 - 902) / 902] x 100
Subtract the new number by the original number
451 - 902 = -451
-451 ÷ 902 = -0.5
-0.5 x 100 = -50%
Example