278.02% is the change from 91 to 344
Calculation steps:
[( 344 - 91 ) ÷ 91] x 100 = 278.02%
Formula
Percentage change = [(344 - 91) / 91] x 100
Subtract the new number by the original number
344 - 91 = 253
253 ÷ 91 = 2.78021978021978
2.78021978021978 x 100 = 278.02%