15 is what percent of 12/24?

Question

if someone makes 12.24/hr now, and gets a raise of 15.00/hr - what percent increase is that?

Answer 1

12/24=½, so p/100=15/½=30, so p=3000%.

Your other question makes more sense if the hourly rate increases from 12.24 to 15.00. 15.00-12.24=2.76.

The percentage increase is 2.76/12.24×100=22.55% approx.