87.76% is the change from 343 to 644
Calculation steps:
[( 644 - 343 ) ÷ 343] x 100 = 87.76%
Formula
Percentage change = [(644 - 343) / 343] x 100
Subtract the new number by the original number
644 - 343 = 301
301 ÷ 343 = 0.8775510204081632
0.8775510204081632 x 100 = 87.76%