82.5% is the change from 400 to 730
Calculation steps:
[( 730 - 400 ) ÷ 400] x 100 = 82.5%
Formula
Percentage change = [(730 - 400) / 400] x 100
Subtract the new number by the original number
730 - 400 = 330
330 ÷ 400 = 0.825
0.825 x 100 = 82.5%
Example