-6.47% is the change from 278 to 260
Calculation steps:
[( 260 - 278 ) ÷ 278] x 100 = -6.47%
Formula
Percentage change = [(260 - 278) / 278] x 100
Subtract the new number by the original number
260 - 278 = -18
-18 ÷ 278 = -0.06474820143884892
-0.06474820143884892 x 100 = -6.47%