87.79% is the change from 344 to 646
Calculation steps:
[( 646 - 344 ) ÷ 344] x 100 = 87.79%
Formula
Percentage change = [(646 - 344) / 344] x 100
Subtract the new number by the original number
646 - 344 = 302
302 ÷ 344 = 0.877906976744186
0.877906976744186 x 100 = 87.79%