1243.48% is the change from 23 to 309
Calculation steps:
[( 309 - 23 ) ÷ 23] x 100 = 1243.48%
Formula
Percentage change = [(309 - 23) / 23] x 100
Subtract the new number by the original number
309 - 23 = 286
286 ÷ 23 = 12.434782608695652
12.434782608695652 x 100 = 1243.48%