Amanda,
In that case try:
=LOOKUP(C5,{100,200,300,400,500,600,1000,1500,2000,2500},{"A","B","C","D","E","F","G","H","I","J"})
you could also put the 100 - 2500 and A - J in cells and reference them
like:
=LOOKUP(C5,I1:I10,J1:J10)
notice that the letters do not need quotes around them when in cells.
The advantage of the second method is that it is easier to chnge the ranges

Signature
HTH
Sandy
In Perth, the ancient capital of Scotland
and the crowning place of kings
sandymann2@mailinator.com
Replace@mailinator.com with @tiscali.co.uk
> Hi,
>
[quoted text clipped - 41 lines]
>> >
>> > Amanda