Hi,
It would have helped immensely if you had told us the password to the sheet you protected which contains your lookup table, and which of your 3 tests took precedence.
One way would be to a couple of extra columns to your lookup table and add 7.5 and 45 to the original values.
Then use a helper column on your calculator sheet to hold IF() functions which determine which column of the VLOOKUP() table to use.
The helper column I cell I2 would be
and use G2+I2 in place of the G2
Untested for the actual VLOOKUP table since I can't see it, but I guess you can see the principle. Adjust the helper column as necessary.
HTH
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