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A picture measuring 18 cm by 14 cm is placed inside a frame leaving a margin of uniform width all around the picture. The width of the margin is y centimetre and the area of the frame is #320 cm^2#. The margin is covered with velvet material at a cost of sh 8.50 per square centimetre.
a) Draw a sketch of the frame, the picture and the margin.
b) Determine
i. the value of y.
ii. the dimensions of the frame.
c) Calculate the cost of the material required to cover the margin.