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1. First we tried to find out the perimeter of the shapes with the same dimensions.
2. We then found 3 pairs with the same size but different costs.
3. We looked at K and I and we used the £60 difference to find out the cost of the frame per centimetre and the area per centimetre squared.
4. We worked out the perimeter of each shape which was how we found out the amount per frame.
5. Then we tried to work out the area of each shape.
6. We worked out that the frame was £20 per centimetre and we found out that the glass was £10 per centimetre squared. Then we discovered that E was incorrect. E had a £110 difference but it was actually meant to have a £40 difference because it only used two more centimetre of frame.