A stationery shop sold 120 notebooks of two types, A and B, for a total of Rs. 4,020. Each notebook of type A costs Rs. 40 and each of type B costs Rs. 25. Let x and y denote the number of notebooks of types A and B sold, respectively.
(i) Write the two linear equations in x and y that model the above information.
(ii) Express these equations in the matrix form AX=B, clearly stating the matrices A, X and B."