242.5% is the change from 80 to 274
Calculation steps:
[( 274 - 80 ) ÷ 80] x 100 = 242.5%
Formula
Percentage change = [(274 - 80) / 80] x 100
Subtract the new number by the original number
274 - 80 = 194
194 ÷ 80 = 2.425
2.425 x 100 = 242.5%
Example