-76% is the change from 50 to 12
Calculation steps:
[( 12 - 50 ) ÷ 50] x 100 = -76%
Formula
Percentage change = [(12 - 50) / 50] x 100
Subtract the new number by the original number
12 - 50 = -38
-38 ÷ 50 = -0.76
-0.76 x 100 = -76%
Example