100% is the change from 378 to 756
Calculation steps:
[( 756 - 378 ) ÷ 378] x 100 = 100%
Formula
Percentage change = [(756 - 378) / 378] x 100
Subtract the new number by the original number
756 - 378 = 378
378 ÷ 378 = 1
1 x 100 = 100%
Example