84.97% is the change from 346 to 640
Calculation steps:
[( 640 - 346 ) ÷ 346] x 100 = 84.97%
Formula
Percentage change = [(640 - 346) / 346] x 100
Subtract the new number by the original number
640 - 346 = 294
294 ÷ 346 = 0.8497109826589595
0.8497109826589595 x 100 = 84.97%