40.32% is the change from 620 to 870
Calculation steps:
[( 870 - 620 ) ÷ 620] x 100 = 40.32%
Formula
Percentage change = [(870 - 620) / 620] x 100
Subtract the new number by the original number
870 - 620 = 250
250 ÷ 620 = 0.4032258064516129
0.4032258064516129 x 100 = 40.32%