Having a mental block at the moment...
Its an IF statement with figure that falls into one of the attachment points (below). From this the factor is given and the cell below should show the relevant factor
I.e in a1 = 112 and therefore attachment of 100-124, which means in cell a2=2.778
125 - 149 1.667
100 - 124 2.778
75 - 99 4.630
50 -74 7.716
25 - 49 12.860
I have attached a worksheet with just the table in and a1 filled in.
If you can have a look that would be great, im not so great with between figures!