96.49% is the change from 399 to 784
Calculation steps:
[( 784 - 399 ) ÷ 399] x 100 = 96.49%
Formula
Percentage change = [(784 - 399) / 399] x 100
Subtract the new number by the original number
784 - 399 = 385
385 ÷ 399 = 0.9649122807017544
0.9649122807017544 x 100 = 96.49%