(8) Within 7 days immediately following the date of the expiration of the period within which members are allowed to give their notices of election to dissent, or within 7 days immediately following the date on which the proposed action is put into effect, whichever is later, the international business company shall make a written offer to each dissenting member, to purchase his or her shares at a specified price that the international business company determines to be their fair value, and if, within 30 days immediately following the date on which the offer is made, the international business company making the offer and the dissenting member agree upon the price to be paid for his or her shares, the international business company shall pay to the member the amount in money upon the surrender of the certificates representing his or her shares.