-6.35% is the change from 520 to 487
Calculation steps:
[( 487 - 520 ) ÷ 520] x 100 = -6.35%
Formula
Percentage change = [(487 - 520) / 520] x 100
Subtract the new number by the original number
487 - 520 = -33
-33 ÷ 520 = -0.06346153846153846
-0.06346153846153846 x 100 = -6.35%