66.47% is the change from 340 to 566
Calculation steps:
[( 566 - 340 ) ÷ 340] x 100 = 66.47%
Formula
Percentage change = [(566 - 340) / 340] x 100
Subtract the new number by the original number
566 - 340 = 226
226 ÷ 340 = 0.6647058823529411
0.6647058823529411 x 100 = 66.47%