223.23% is the change from 99 to 320
Calculation steps:
[( 320 - 99 ) ÷ 99] x 100 = 223.23%
Formula
Percentage change = [(320 - 99) / 99] x 100
Subtract the new number by the original number
320 - 99 = 221
221 ÷ 99 = 2.2323232323232323
2.2323232323232323 x 100 = 223.23%