42.13% is the change from 591 to 840
Calculation steps:
[( 840 - 591 ) ÷ 591] x 100 = 42.13%
Formula
Percentage change = [(840 - 591) / 591] x 100
Subtract the new number by the original number
840 - 591 = 249
249 ÷ 591 = 0.4213197969543147
0.4213197969543147 x 100 = 42.13%