1200% is the change from 24 to 312
Calculation steps:
[( 312 - 24 ) ÷ 24] x 100 = 1200%
Formula
Percentage change = [(312 - 24) / 24] x 100
Subtract the new number by the original number
312 - 24 = 288
288 ÷ 24 = 12
12 x 100 = 1200%
Example