-53.4% is the change from 515 to 240
Calculation steps:
[( 240 - 515 ) ÷ 515] x 100 = -53.4%
Formula
Percentage change = [(240 - 515) / 515] x 100
Subtract the new number by the original number
240 - 515 = -275
-275 ÷ 515 = -0.5339805825242718
-0.5339805825242718 x 100 = -53.4%