215.15% is the change from 99 to 312
Calculation steps:
[( 312 - 99 ) ÷ 99] x 100 = 215.15%
Formula
Percentage change = [(312 - 99) / 99] x 100
Subtract the new number by the original number
312 - 99 = 213
213 ÷ 99 = 2.1515151515151514
2.1515151515151514 x 100 = 215.15%