1212.5% is the change from 24 to 315
Calculation steps:
[( 315 - 24 ) ÷ 24] x 100 = 1212.5%
Formula
Percentage change = [(315 - 24) / 24] x 100
Subtract the new number by the original number
315 - 24 = 291
291 ÷ 24 = 12.125
12.125 x 100 = 1212.5%
Example