-7.77% is the change from 515 to 475
Calculation steps:
[( 475 - 515 ) ÷ 515] x 100 = -7.77%
Formula
Percentage change = [(475 - 515) / 515] x 100
Subtract the new number by the original number
475 - 515 = -40
-40 ÷ 515 = -0.07766990291262135
-0.07766990291262135 x 100 = -7.77%