Commercial credit terms are made with the understanding and agreement that all the charges will be due and payable within 10 days from the date of monthly invoice, and that a monthly billing charge of Ten Dollars plus one and one-half percent (1 ½%) of the total amount of the invoice will be paid on account balances that are past due. In the event that the account becomes delinquent, the undersigned agrees to pay all attorney's fees and costs extended to effect collection of the account. In the event that suit is brought to collect the account, the applicant agrees the venue for such suit shall reside in Greene County, Missouri.