-98.21% is the change from 280 to 5
Calculation steps:
[( 5 - 280 ) ÷ 280] x 100 = -98.21%
Formula
Percentage change = [(5 - 280) / 280] x 100
Subtract the new number by the original number
5 - 280 = -275
-275 ÷ 280 = -0.9821428571428571
-0.9821428571428571 x 100 = -98.21%