-42.37% is the change from 590 to 340
Calculation steps:
[( 340 - 590 ) ÷ 590] x 100 = -42.37%
Formula
Percentage change = [(340 - 590) / 590] x 100
Subtract the new number by the original number
340 - 590 = -250
-250 ÷ 590 = -0.423728813559322
-0.423728813559322 x 100 = -42.37%