17.86% is the change from 84 to 99
Calculation steps:
[( 99 - 84 ) ÷ 84] x 100 = 17.86%
Formula
Percentage change = [(99 - 84) / 84] x 100
Subtract the new number by the original number
99 - 84 = 15
15 ÷ 84 = 0.17857142857142858
0.17857142857142858 x 100 = 17.86%