-75% is the change from 28 to 7
Calculation steps:
[( 7 - 28 ) ÷ 28] x 100 = -75%
Formula
Percentage change = [(7 - 28) / 28] x 100
Subtract the new number by the original number
7 - 28 = -21
-21 ÷ 28 = -0.75
-0.75 x 100 = -75%
Example