-46.15% is the change from 13 to 7
Calculation steps:
[( 7 - 13 ) ÷ 13] x 100 = -46.15%
Formula
Percentage change = [(7 - 13) / 13] x 100
Subtract the new number by the original number
7 - 13 = -6
-6 ÷ 13 = -0.46153846153846156
-0.46153846153846156 x 100 = -46.15%