-52.4% is the change from 521 to 248
Calculation steps:
[( 248 - 521 ) ÷ 521] x 100 = -52.4%
Formula
Percentage change = [(248 - 521) / 521] x 100
Subtract the new number by the original number
248 - 521 = -273
-273 ÷ 521 = -0.5239923224568138
-0.5239923224568138 x 100 = -52.4%