1720% is the change from 45 to 819
Calculation steps:
[( 819 - 45 ) ÷ 45] x 100 = 1720%
Formula
Percentage change = [(819 - 45) / 45] x 100
Subtract the new number by the original number
819 - 45 = 774
774 ÷ 45 = 17.2
17.2 x 100 = 1720%
Example