5. Two or more agreements when treated as a single hire-purchase agreement.- Where by virtue of two or more agreements in writing, none of which by itself constitutes a hire-purchase agreement, there is a bailment of goods and the bailee has an option to purchase the goods and the requirements of section 3 and section 4 are satisfied in relation to such agreements, the agreements shall be treated for the purposes of this Act as a single hire-purchase agreement made at the time when the last of the agreements was made. | 