49.9% is the change from 521 to 781
Calculation steps:
[( 781 - 521 ) ÷ 521] x 100 = 49.9%
Formula
Percentage change = [(781 - 521) / 521] x 100
Subtract the new number by the original number
781 - 521 = 260
260 ÷ 521 = 0.4990403071017274
0.4990403071017274 x 100 = 49.9%