312.5% is the change from 80 to 330
Calculation steps:
[( 330 - 80 ) ÷ 80] x 100 = 312.5%
Formula
Percentage change = [(330 - 80) / 80] x 100
Subtract the new number by the original number
330 - 80 = 250
250 ÷ 80 = 3.125
3.125 x 100 = 312.5%
Example