-82.95% is the change from 88 to 15
Calculation steps:
[( 15 - 88 ) ÷ 88] x 100 = -82.95%
Formula
Percentage change = [(15 - 88) / 88] x 100
Subtract the new number by the original number
15 - 88 = -73
-73 ÷ 88 = -0.8295454545454546
-0.8295454545454546 x 100 = -82.95%