247.5% is the change from 80 to 278
Calculation steps:
[( 278 - 80 ) ÷ 80] x 100 = 247.5%
Formula
Percentage change = [(278 - 80) / 80] x 100
Subtract the new number by the original number
278 - 80 = 198
198 ÷ 80 = 2.475
2.475 x 100 = 247.5%
Example