A enterprise prepared introduced a article line, introduced this line need 1.5 million Yuan, enterprise can has two kind of payment way, one is in signed once paid; also has a payment way, when signed...

A enterprise prepared introduced a article line, introduced this line need 1.5 million Yuan, enterprise can has two kind of payment way, one is in signed once paid; also has a payment way, when signed pay 500,000 , line two years later put operations, then from annual of sales 4 million in the extraction 5% for repayment (third end began), total eight years, asked enterprise need take what payment way, years rates 10%?