-30.04% is the change from 486 to 340
Calculation steps:
[( 340 - 486 ) ÷ 486] x 100 = -30.04%
Formula
Percentage change = [(340 - 486) / 486] x 100
Subtract the new number by the original number
340 - 486 = -146
-146 ÷ 486 = -0.3004115226337449
-0.3004115226337449 x 100 = -30.04%