163.64% is the change from 99 to 261
Calculation steps:
[( 261 - 99 ) ÷ 99] x 100 = 163.64%
Formula
Percentage change = [(261 - 99) / 99] x 100
Subtract the new number by the original number
261 - 99 = 162
162 ÷ 99 = 1.6363636363636365
1.6363636363636365 x 100 = 163.64%