-74.36% is the change from 39 to 10
Calculation steps:
[( 10 - 39 ) ÷ 39] x 100 = -74.36%
Formula
Percentage change = [(10 - 39) / 39] x 100
Subtract the new number by the original number
10 - 39 = -29
-29 ÷ 39 = -0.7435897435897436
-0.7435897435897436 x 100 = -74.36%