-16.05% is the change from 405 to 340
Calculation steps:
[( 340 - 405 ) ÷ 405] x 100 = -16.05%
Formula
Percentage change = [(340 - 405) / 405] x 100
Subtract the new number by the original number
340 - 405 = -65
-65 ÷ 405 = -0.16049382716049382
-0.16049382716049382 x 100 = -16.05%