-33.85% is the change from 520 to 344
Calculation steps:
[( 344 - 520 ) ÷ 520] x 100 = -33.85%
Formula
Percentage change = [(344 - 520) / 520] x 100
Subtract the new number by the original number
344 - 520 = -176
-176 ÷ 520 = -0.3384615384615385
-0.3384615384615385 x 100 = -33.85%