The answer choice below (or above) me is correct I beleive I just wanted to show proof.
15 Γ· 249 = 0.06024096
20 Γ· 332 = 0.06024096
As you can see both numbers are equal and if you round it the unit rate will be 0.06Β’ (maybe im not sure if you'll have to change the 15 since we moved the decimal in 2.49)