Ineed with number 15 and 16.how do i find it?

The measure of angle 0 is 600 degrees

The floor of a building consists of 3000 tiles which are rhombus shaped and each of it's diagonals are 45 cm and 30 cm in length. find the total cost of polishing the floor, if the cost per m² is rs. 4.

The bottom of a vase is a square.each side measury y+11 units.the square has a perimeter of 55 units what is the value of y?