518.75% is the change from 16 to 99
Calculation steps:
[( 99 - 16 ) ÷ 16] x 100 = 518.75%
Formula
Percentage change = [(99 - 16) / 16] x 100
Subtract the new number by the original number
99 - 16 = 83
83 ÷ 16 = 5.1875
5.1875 x 100 = 518.75%
Example