-45.42% is the change from 513 to 280
Calculation steps:
[( 280 - 513 ) ÷ 513] x 100 = -45.42%
Formula
Percentage change = [(280 - 513) / 513] x 100
Subtract the new number by the original number
280 - 513 = -233
-233 ÷ 513 = -0.45419103313840153
-0.45419103313840153 x 100 = -45.42%