Such base finance charge and service charges may be computed on a basis of a full month for any fractional period in excess of ten days. For a fractional period of a month not in excess of ten days, there shall be no base finance charge or service charge.
Sections 1317.01 to 1317.11 of the Revised Code do not apply to any sale in which the base finance and service charge does not exceed the sum of fifteen dollars.
A provision for the payment of interest on any installment not paid in full on or before its scheduled due date at a rate not to exceed one and one-half per cent interest per month is not a delinquent charge and is expressly authorized.
R.C. §1317.06