-37.5% is the change from 520 to 325
Calculation steps:
[( 325 - 520 ) ÷ 520] x 100 = -37.5%
Formula
Percentage change = [(325 - 520) / 520] x 100
Subtract the new number by the original number
325 - 520 = -195
-195 ÷ 520 = -0.375
-0.375 x 100 = -37.5%