311.54% is the change from 78 to 321
Calculation steps:
[( 321 - 78 ) ÷ 78] x 100 = 311.54%
Formula
Percentage change = [(321 - 78) / 78] x 100
Subtract the new number by the original number
321 - 78 = 243
243 ÷ 78 = 3.1153846153846154
3.1153846153846154 x 100 = 311.54%