-83.33% is the change from 18 to 3
Calculation steps:
[( 3 - 18 ) ÷ 18] x 100 = -83.33%
Formula
Percentage change = [(3 - 18) / 18] x 100
Subtract the new number by the original number
3 - 18 = -15
-15 ÷ 18 = -0.8333333333333334
-0.8333333333333334 x 100 = -83.33%