-77.94% is the change from 68 to 15
Calculation steps:
[( 15 - 68 ) ÷ 68] x 100 = -77.94%
Formula
Percentage change = [(15 - 68) / 68] x 100
Subtract the new number by the original number
15 - 68 = -53
-53 ÷ 68 = -0.7794117647058824
-0.7794117647058824 x 100 = -77.94%