-28.79% is the change from 66 to 47
Calculation steps:
[( 47 - 66 ) ÷ 66] x 100 = -28.79%
Formula
Percentage change = [(47 - 66) / 66] x 100
Subtract the new number by the original number
47 - 66 = -19
-19 ÷ 66 = -0.2878787878787879
-0.2878787878787879 x 100 = -28.79%