57.06% is the change from 340 to 534
Calculation steps:
[( 534 - 340 ) ÷ 340] x 100 = 57.06%
Formula
Percentage change = [(534 - 340) / 340] x 100
Subtract the new number by the original number
534 - 340 = 194
194 ÷ 340 = 0.5705882352941176
0.5705882352941176 x 100 = 57.06%