i have a proble. i need to figure aout the rate
i have a customer table, a rate table that looks like this

code, country, rate 1, rate 2, rate 3, rate n
---------------------------------------------------

011575 Colombia .23 .25 .23 .21
011957 Braxil .33 .32 .15 .40
011875 Barbados .10 .12 .18 .13

how do i determine the rate for each call according to the rate that i preset on my customer screen

if the call was 0115758340625 i was co colombia but the customer has a rate 1