-82.05% is the change from 39 to 7
Calculation steps:
[( 7 - 39 ) ÷ 39] x 100 = -82.05%
Formula
Percentage change = [(7 - 39) / 39] x 100
Subtract the new number by the original number
7 - 39 = -32
-32 ÷ 39 = -0.8205128205128205
-0.8205128205128205 x 100 = -82.05%