249.4% is the change from 249 to 870
Calculation steps:
[( 870 - 249 ) ÷ 249] x 100 = 249.4%
Formula
Percentage change = [(870 - 249) / 249] x 100
Subtract the new number by the original number
870 - 249 = 621
621 ÷ 249 = 2.4939759036144578
2.4939759036144578 x 100 = 249.4%