turnover

Father Michael's Wraps (pitas, wraps, flat breads) is experiencing turnover in the range of 100 percent.  Most of this occurs in the first 18 months of employment. How would you determine if this turnover rate is high? How would you justify to your boss the lower turnover is strategically important? What would you look at in both pay and other forms of rewards to identify ways of reducing turnover? Justify your choices.