Ranges

Hi,
I need help on the following:
I need to arrive at the stage to identify whether a person’s income is too high or within acceptable parameters.

Example:
Person’s income: $20000
Loan/income Ratio: 33%

Ranges:
$ INCOME MAX LOAN /INCOME
<15000 25%
15001 – 35000 30%
>35000 35%
In this example the person’s income of $20000 falls within the second tier however it is in excess of the maximum range within that tier.

Any help will be greatly appreciated
Thank you