88.89% is the change from 45 to 85
Calculation steps:
[( 85 - 45 ) ÷ 45] x 100 = 88.89%
Formula
Percentage change = [(85 - 45) / 45] x 100
Subtract the new number by the original number
85 - 45 = 40
40 ÷ 45 = 0.8888888888888888
0.8888888888888888 x 100 = 88.89%