-79.71% is the change from 207 to 42
Calculation steps:
[( 42 - 207 ) ÷ 207] x 100 = -79.71%
Formula
Percentage change = [(42 - 207) / 207] x 100
Subtract the new number by the original number
42 - 207 = -165
-165 ÷ 207 = -0.7971014492753623
-0.7971014492753623 x 100 = -79.71%