grouping (if statement) with alphanumeric characters

IF [item] = ‘item1’ AND

([Price] >= 24.00 AND [Price] <= 39.10) THEN 'group1'

ELSEIF [item] = ‘item1 ’AND ([Price] >= 40  AND [Price] <= 50) THEN 'group2'

ELSEIF [item] = ‘item1’ AND ([Price]   >= 50 AND [Price] <= 60 ) THEN 'group3'

ELSEIF [Price] == 66 THEN  'group3'

END

in the above if statment in the range 50-60 there are three other values such as 59a,59b and 59c.

As price is a numeric field these values are getting ignore.

I tried using functions such as left and contains, error cannot use float values with teh string functions is displayed.

any suggestions on how can i handle this