-66.25% is the change from 80 to 27
Calculation steps:
[( 27 - 80 ) ÷ 80] x 100 = -66.25%
Formula
Percentage change = [(27 - 80) / 80] x 100
Subtract the new number by the original number
27 - 80 = -53
-53 ÷ 80 = -0.6625
-0.6625 x 100 = -66.25%
Example