81.47% is the change from 340 to 617
Calculation steps:
[( 617 - 340 ) ÷ 340] x 100 = 81.47%
Formula
Percentage change = [(617 - 340) / 340] x 100
Subtract the new number by the original number
617 - 340 = 277
277 ÷ 340 = 0.8147058823529412
0.8147058823529412 x 100 = 81.47%