Calculate a formula based on different columns based on fig in another coloum

[spenctr01]

formula =(100*2*CP64)/(CS64*CX64)

The 2 in the formula could be a 3 or a 4 based on a value in another call it the "No" column which could be between 5-40 and is the very end col on the ssheet if its less than 8 it should be a 2 if its >8,<=16 it should be a 3 if its great than 16 it should be a 4 . How do I do this formula any help greatly appreciated. Tony

Added file formula in bold

[etaf]

how about
Assuming column B is the NO column
=(100*IF(B2<8,2,IF(B2<12,3,4))*CP64)/(CS64*CX64)

will also be a 2 if cell is blank

Also
if its 8 , it will be 3
if its 12, it will be 4

you may need an < =

A sample sheet would help here


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