(a) who owns or holds such foreign exchange as may be specified in the notification, to offer it, or cause it to be offered, for sale to the Reserve Bank on behalf of the Central Government or to such person, as the Reserve Bank may authorise for the purpose, at such price as the Central Government may fix, being a price which is not less than the price calculated at the rate of exchange for the time being authorised by the Reserve Bank;

(b) who is entitled to assign any right to receive such foreign exchange as may be specified in the notification, to transfer that right to the Reserve Bank on behalf of the Central Government on payment of such consideration therefor as the Central Government may fix having regard to the rate for the time being authorised by the Reserve Bank in pursuance of sub-section (2) of section 8 for conversion into Indian currency of the foreign currency in which such foreign exchange is expressed: