-45.84% is the change from 517 to 280
Calculation steps:
[( 280 - 517 ) ÷ 517] x 100 = -45.84%
Formula
Percentage change = [(280 - 517) / 517] x 100
Subtract the new number by the original number
280 - 517 = -237
-237 ÷ 517 = -0.4584139264990329
-0.4584139264990329 x 100 = -45.84%