-9.98% is the change from 501 to 451
Calculation steps:
[( 451 - 501 ) ÷ 501] x 100 = -9.98%
Formula
Percentage change = [(451 - 501) / 501] x 100
Subtract the new number by the original number
451 - 501 = -50
-50 ÷ 501 = -0.0998003992015968
-0.0998003992015968 x 100 = -9.98%