-68.75% is the change from 48 to 15
Calculation steps:
[( 15 - 48 ) ÷ 48] x 100 = -68.75%
Formula
Percentage change = [(15 - 48) / 48] x 100
Subtract the new number by the original number
15 - 48 = -33
-33 ÷ 48 = -0.6875
-0.6875 x 100 = -68.75%
Example