-7.95% is the change from 302 to 278
Calculation steps:
[( 278 - 302 ) ÷ 302] x 100 = -7.95%
Formula
Percentage change = [(278 - 302) / 302] x 100
Subtract the new number by the original number
278 - 302 = -24
-24 ÷ 302 = -0.07947019867549669
-0.07947019867549669 x 100 = -7.95%