-98.75% is the change from 240 to 3
Calculation steps:
[( 3 - 240 ) ÷ 240] x 100 = -98.75%
Formula
Percentage change = [(3 - 240) / 240] x 100
Subtract the new number by the original number
3 - 240 = -237
-237 ÷ 240 = -0.9875
-0.9875 x 100 = -98.75%
Example