99.5% is the change from 399 to 796
Calculation steps:
[( 796 - 399 ) ÷ 399] x 100 = 99.5%
Formula
Percentage change = [(796 - 399) / 399] x 100
Subtract the new number by the original number
796 - 399 = 397
397 ÷ 399 = 0.9949874686716792
0.9949874686716792 x 100 = 99.5%