I would truly appreciate if you could help me out

Daenerys Targaryen is feeling vengeful, so that she has a 30% chance of showing mercy to King's Landing. If she does so, there's still a 60% chance that everyone will think she's insane. If she doesn't show mercy, there's any 80% chance that everyone will think she's insane. A messenger comes to you and says, "Daenerys is insane." Assuming the messenger isn't lying, what is the probability that Daenervs showed mercy? (4 decimal places) The total cost of producing Q guitars is C (Q) = 1000 + 100Q 0,25Q2. Find the marginal average cost when producing 50 guitars. (2 decimal places)