The valueofthe supply of goodsor servicesor both between distinct personsas specified in sub-section (4) and (5) of section.25 or where the supplier and recipient are related, other than where the supply is made through an agent, shall-
(a) be the open market value of such supply;
(b) if the open market value is not available, be the value of supply of goods or services oflike kind and quality; .
(c) if the value is not determinable under clause (a) or (b), be the value as determined by the application of rule 30 orrule 31, in that order:
Provided that where the goodsare intended for further supply as such by the recipient, the value shall, at the option of the supplier, be an amount equivalent to ninety percent of the price charged for the supply of goodsoflike kind and quality by the recipient tohis customer not being a related person:
Provided further that where the recipient is eligible for full input tax credit, the value declared in the invoice shall be deemed to be the open market value ofthe goodsorservices.