-20.34% is the change from 349 to 278
Calculation steps:
[( 278 - 349 ) ÷ 349] x 100 = -20.34%
Formula
Percentage change = [(278 - 349) / 349] x 100
Subtract the new number by the original number
278 - 349 = -71
-71 ÷ 349 = -0.2034383954154728
-0.2034383954154728 x 100 = -20.34%