-19.77% is the change from 349 to 280
Calculation steps:
[( 280 - 349 ) ÷ 349] x 100 = -19.77%
Formula
Percentage change = [(280 - 349) / 349] x 100
Subtract the new number by the original number
280 - 349 = -69
-69 ÷ 349 = -0.1977077363896848
-0.1977077363896848 x 100 = -19.77%