Really struggling with a piece of work that hopefully one of you can kindly help with.

I am basically look for a type of count that will not jump up a whole number when it reaches .9. For example, I am looking for my count to go from;

5.8

5.9

5.10

5.11

5.12

Here is a sample of my data;

rank(L) count(M) Lookup(O)

1 1 1.1

2 1 2.1

3 1 3.1

4 1 4.1

5 11 5.1

6 0 5.2

7 0 5.3

8 0 5.4

9 0 5.5

10 0 5.6

11 0 5.7

12 0 5.8

13 0 5.9

14 0 6

15 0 6.1

16 1 16.1

17 1 17.1

18 1 18.1

my data is showing that there are 11 counts of "5", so therefore I require my "lookup" field formula to display 5.1 to 5.11. Instead it is displaying 5.1 to 6.1. The formula I am currently using is;

=(IF(M9>0,L9&"."&"1",O8+0.1))

Any suggestions or is what I am after not even possible?

Thanks

Gavin