-80% is the change from 65 to 13
Calculation steps:
[( 13 - 65 ) ÷ 65] x 100 = -80%
Formula
Percentage change = [(13 - 65) / 65] x 100
Subtract the new number by the original number
13 - 65 = -52
-52 ÷ 65 = -0.8
-0.8 x 100 = -80%
Example