-98.7% is the change from 540 to 7
Calculation steps:
[( 7 - 540 ) ÷ 540] x 100 = -98.7%
Formula
Percentage change = [(7 - 540) / 540] x 100
Subtract the new number by the original number
7 - 540 = -533
-533 ÷ 540 = -0.987037037037037
-0.987037037037037 x 100 = -98.7%