A rectangular notice board has breadth x cm and length (3x−4) cm.
The area of the board is 1120 cm².
(i) Find the value of x and hence determine the exact dimensions of the board in centimetres.
(ii) Express these dimensions in metres correct to two decimal places.
(iii) The board is to be edged with a decorative strip that costs Rs 15 per metre. Find the total cost of edging the board.