What contract is better to accept for more money back when this artists opportunity cost is 5% p.a.?

a) Warner Brothers offers a payment of $4 million now on his next album plus 50% royalty on gross sales of $8 million for two years, with the royalties paid at the end of years 2 and 3. It will launch a line of spirderman branded clothing and other gear, paying $100,000 royalty on gross sales for five years, with the first payment end of year 1. How much is this contract worth?

b) Height Bridge the label. Offers no advances, but 70% gross royalty on the next album (same sales pattern) and a guaranteed main to side role in a film about a boy who overcomes black widow bite to becoming next spiderman. He would be paid $7 million in two years time for the film role. How much is this contract worth?