135.29% is the change from 340 to 800
Calculation steps:
[( 800 - 340 ) ÷ 340] x 100 = 135.29%
Formula
Percentage change = [(800 - 340) / 340] x 100
Subtract the new number by the original number
800 - 340 = 460
460 ÷ 340 = 1.3529411764705883
1.3529411764705883 x 100 = 135.29%