Combination of IF and ISERROR problem

Hi,

I need to create a formula that will check a specific character in a column and return a value and if there is none it will try to check another column for a different sets of conditions.

Here is the sample formula that I have done so far it returns the values and false.

A - That has a % in the cell will return "Discounted Term"
B - Other.

=IF(ISERR(SEARCH("%",M2324)),IF(N2324=0,"Pay on Receipt",IF(N2324<=30,"1 to 30 Days",IF(N2324<=49,"31 to 49 Days",IF(N2324<=79,"50 to 79 Days",IF(N2324<=90,"80 to 90 Days",IF(N2324>90,"91+ Days","Discounted Term")))))))