I have a insurance spreadsheet that I need to calculate the premium amount
based on the age of the employee. The rates are determined by an age range.

My spreadsheet is like this:
Age Premium
50 ?
30 ?

The rates a
under 30 .05/1000
30-34 .07/1000
35-39 .09/1000
40-44 .14/1000
45-49 .25/1000
50-54 .42/1000
etc