78.96% is the change from 309 to 553
Calculation steps:
[( 553 - 309 ) ÷ 309] x 100 = 78.96%
Formula
Percentage change = [(553 - 309) / 309] x 100
Subtract the new number by the original number
553 - 309 = 244
244 ÷ 309 = 0.7896440129449838
0.7896440129449838 x 100 = 78.96%