41.5% is the change from 612 to 866
Calculation steps:
[( 866 - 612 ) ÷ 612] x 100 = 41.5%
Formula
Percentage change = [(866 - 612) / 612] x 100
Subtract the new number by the original number
866 - 612 = 254
254 ÷ 612 = 0.4150326797385621
0.4150326797385621 x 100 = 41.5%