-18.13% is the change from 342 to 280
Calculation steps:
[( 280 - 342 ) ÷ 342] x 100 = -18.13%
Formula
Percentage change = [(280 - 342) / 342] x 100
Subtract the new number by the original number
280 - 342 = -62
-62 ÷ 342 = -0.18128654970760233
-0.18128654970760233 x 100 = -18.13%