200% is the change from 45 to 135
Calculation steps:
[( 135 - 45 ) ÷ 45] x 100 = 200%
Formula
Percentage change = [(135 - 45) / 45] x 100
Subtract the new number by the original number
135 - 45 = 90
90 ÷ 45 = 2
2 x 100 = 200%
Example