-38.46% is the change from 390 to 240
Calculation steps:
[( 240 - 390 ) ÷ 390] x 100 = -38.46%
Formula
Percentage change = [(240 - 390) / 390] x 100
Subtract the new number by the original number
240 - 390 = -150
-150 ÷ 390 = -0.38461538461538464
-0.38461538461538464 x 100 = -38.46%