2. The angel publisher asks a printer for quotations on the cost of printing 1000 and 2000 copies of a book. The printer quotes Tk. 4,500 for 1,000 copies and Tk. 7,500 for 2,000 copies. Assume that cost, y is linearly related to x, the number of books printed. i) Write the co-ordinates of the given points. ii) Find the equation of the line. iii) What is the cost of printing 2500 copies? 10