309.5% is the change from 242 to 991
Calculation steps:
[( 991 - 242 ) ÷ 242] x 100 = 309.5%
Formula
Percentage change = [(991 - 242) / 242] x 100
Subtract the new number by the original number
991 - 242 = 749
749 ÷ 242 = 3.0950413223140494
3.0950413223140494 x 100 = 309.5%