1320% is the change from 45 to 639
Calculation steps:
[( 639 - 45 ) ÷ 45] x 100 = 1320%
Formula
Percentage change = [(639 - 45) / 45] x 100
Subtract the new number by the original number
639 - 45 = 594
594 ÷ 45 = 13.2
13.2 x 100 = 1320%
Example