17.65% is the change from 85 to 100
Calculation steps:
[( 100 - 85 ) ÷ 85] x 100 = 17.65%
Formula
Percentage change = [(100 - 85) / 85] x 100
Subtract the new number by the original number
100 - 85 = 15
15 ÷ 85 = 0.17647058823529413
0.17647058823529413 x 100 = 17.65%