98.38% is the change from 309 to 613
Calculation steps:
[( 613 - 309 ) ÷ 309] x 100 = 98.38%
Formula
Percentage change = [(613 - 309) / 309] x 100
Subtract the new number by the original number
613 - 309 = 304
304 ÷ 309 = 0.9838187702265372
0.9838187702265372 x 100 = 98.38%