80% is the change from 405 to 729
Calculation steps:
[( 729 - 405 ) ÷ 405] x 100 = 80%
Formula
Percentage change = [(729 - 405) / 405] x 100
Subtract the new number by the original number
729 - 405 = 324
324 ÷ 405 = 0.8
0.8 x 100 = 80%
Example