The Egg Trays

They see a tray of eggs. The tray contains 12 eggs which cost Rs. 36. Now, if they want an egg tray that has one and half times the eggs in this tray, how much will they need to pay?

Shabana is Jamuni's friend and she wants to buy two egg trays. She finds that there is a mix of both white and brown eggs in each tray. The first tray holds 12 eggs of which 4 are brown and 8 are white. The second tray holds 18 eggs. If the ratio of brown and white eggs is same in both the trays, how many eggs of each colour does the second tray have?