A school purchased three types of notebooks—single-line, double-line and graph notebooks. The details are:
(i) Two single-line and one double-line notebook cost Rs 60.
(ii) One single-line, one double-line and one graph notebook cost Rs 55.
(iii) Three single-line and two graph notebooks cost Rs 110.
Let the costs of a single-line, double-line and graph notebook be Rs x, Rs y and Rs z respectively.
Write the above information as a system of equations and then express it in the matrix form AX=B, clearly identifying A, X and B.