48.53% is the change from 340 to 505
Calculation steps:
[( 505 - 340 ) ÷ 340] x 100 = 48.53%
Formula
Percentage change = [(505 - 340) / 340] x 100
Subtract the new number by the original number
505 - 340 = 165
165 ÷ 340 = 0.4852941176470588
0.4852941176470588 x 100 = 48.53%