285.71% is the change from 84 to 324
Calculation steps:
[( 324 - 84 ) ÷ 84] x 100 = 285.71%
Formula
Percentage change = [(324 - 84) / 84] x 100
Subtract the new number by the original number
324 - 84 = 240
240 ÷ 84 = 2.857142857142857
2.857142857142857 x 100 = 285.71%