-74.97% is the change from 999 to 250
Calculation steps:
[( 250 - 999 ) ÷ 999] x 100 = -74.97%
Formula
Percentage change = [(250 - 999) / 999] x 100
Subtract the new number by the original number
250 - 999 = -749
-749 ÷ 999 = -0.7497497497497497
-0.7497497497497497 x 100 = -74.97%