57. The value for imposition of supplementary duty.—

For the purposes of imposing supplementary duty, the value of the goods or services subject to supplementary duty shall be as follows, namely:—

(a) in relation to an imported good subject to supplementary duty, the value that is arrived at adding customs duty and regulatory duty (if any) with the value on which customs duty is leviable under section 25 or 25(a) of the Customs Act: customs duty is leviable:

(b) in relation to a supply of goods or services subject to supplementary duty, the value of such taxable supply shall be arrived at by deducting the supplementary duty from the value determined under section 32:

Provided that if the supply of any good or service subject to supplementary duty is made without any consideration or with inadequate consideration‚ the value for imposition of supplementary duty on such good or service shall be arrived at by deducting supplementary duty from the tax fraction of the fair market price of such supply; and

(c) in relation to any good where VAT is imposed on the basis of retail prices, the retail price described in section 58(2) shall be regarded as the value for imposition of supplementary duty.