-29.49% is the change from 390 to 275
Calculation steps:
[( 275 - 390 ) ÷ 390] x 100 = -29.49%
Formula
Percentage change = [(275 - 390) / 390] x 100
Subtract the new number by the original number
275 - 390 = -115
-115 ÷ 390 = -0.2948717948717949
-0.2948717948717949 x 100 = -29.49%