-77.78% is the change from 18 to 4
Calculation steps:
[( 4 - 18 ) ÷ 18] x 100 = -77.78%
Formula
Percentage change = [(4 - 18) / 18] x 100
Subtract the new number by the original number
4 - 18 = -14
-14 ÷ 18 = -0.7777777777777778
-0.7777777777777778 x 100 = -77.78%