100% is the change from 392 to 784
Calculation steps:
[( 784 - 392 ) ÷ 392] x 100 = 100%
Formula
Percentage change = [(784 - 392) / 392] x 100
Subtract the new number by the original number
784 - 392 = 392
392 ÷ 392 = 1
1 x 100 = 100%
Example