224.24% is the change from 99 to 321
Calculation steps:
[( 321 - 99 ) ÷ 99] x 100 = 224.24%
Formula
Percentage change = [(321 - 99) / 99] x 100
Subtract the new number by the original number
321 - 99 = 222
222 ÷ 99 = 2.242424242424242
2.242424242424242 x 100 = 224.24%