Excel 2007 : Weird result from concatenation

I usually have no problems using concatenation but I am having a formatting problem for which I have not been able to find a solution so far. Perhaps some of you have seen this before and have a suggestion for me. So here goes:

I have a text value in cell A1: "Incomplete process"
I have a numerical value in cell B1: 52.9 (this is derived from another sheet in the workbook)
I am using this simple formula: =CONCATENATE(a1," ","at"," ",B1," ","per cent")
I am getting the following result (actually it's what I want): Incomplete process at 52.8571428571429 per cent
I like precision just as much as anyone else, but this is a bit overboard... How can I simply get 52.9 instead of that elongated number? This is in Excel 2007.

Any suggestions?

Thanks!