109.24% is the change from 249 to 521
Calculation steps:
[( 521 - 249 ) ÷ 249] x 100 = 109.24%
Formula
Percentage change = [(521 - 249) / 249] x 100
Subtract the new number by the original number
521 - 249 = 272
272 ÷ 249 = 1.0923694779116466
1.0923694779116466 x 100 = 109.24%