49.87% is the change from 399 to 598
Calculation steps:
[( 598 - 399 ) ÷ 399] x 100 = 49.87%
Formula
Percentage change = [(598 - 399) / 399] x 100
Subtract the new number by the original number
598 - 399 = 199
199 ÷ 399 = 0.49874686716791977
0.49874686716791977 x 100 = 49.87%