How to understand this kind of question? Thank you~

Big Cure and Little Cure are both pharmaceutical companies. Big Cure presenlly has a potential 'blockbusler' dmg before the Therapeutic Goods Administration (TGA) waiting for approval. Ii approved. Big Cu re's blockbuster drug will produce $1 billion in net income for Big Cure, Liltle Cure has 10 separate, less important drugs belore the TGA waiting for approval. If approved. each of Little cure's drugs would produce $100 million in net Income for Little Cure. The probablllty of the TGA approving a drug Is 50%. What is the expected payolf tor Little Cura's 10 dmgs? O A $1 billion 0 B. $100 million 0 c. $500 million 0 D. $0