297.5% is the change from 80 to 318
Calculation steps:
[( 318 - 80 ) ÷ 80] x 100 = 297.5%
Formula
Percentage change = [(318 - 80) / 80] x 100
Subtract the new number by the original number
318 - 80 = 238
238 ÷ 80 = 2.975
2.975 x 100 = 297.5%
Example