-57.14% is the change from 35 to 15
Calculation steps:
[( 15 - 35 ) ÷ 35] x 100 = -57.14%
Formula
Percentage change = [(15 - 35) / 35] x 100
Subtract the new number by the original number
15 - 35 = -20
-20 ÷ 35 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%