99.42% is the change from 345 to 688
Calculation steps:
[( 688 - 345 ) ÷ 345] x 100 = 99.42%
Formula
Percentage change = [(688 - 345) / 345] x 100
Subtract the new number by the original number
688 - 345 = 343
343 ÷ 345 = 0.9942028985507246
0.9942028985507246 x 100 = 99.42%