97.1% is the change from 345 to 680
Calculation steps:
[( 680 - 345 ) ÷ 345] x 100 = 97.1%
Formula
Percentage change = [(680 - 345) / 345] x 100
Subtract the new number by the original number
680 - 345 = 335
335 ÷ 345 = 0.9710144927536232
0.9710144927536232 x 100 = 97.1%