-50.36% is the change from 278 to 138
Calculation steps:
[( 138 - 278 ) ÷ 278] x 100 = -50.36%
Formula
Percentage change = [(138 - 278) / 278] x 100
Subtract the new number by the original number
138 - 278 = -140
-140 ÷ 278 = -0.5035971223021583
-0.5035971223021583 x 100 = -50.36%