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We looked at O and E and we discovered that they had the same amount of area and that there was a £110 difference when E has only 2cm of extra frame. We thought that it could be £55 for 1cm of frame but then we found out that 1cm of frame was actually £20 by checking the perimeter of the other shapes. We then knew that it was E that was incorrectly priced because of the £110 difference and there was only 2cm of extra frame. The actual price should have been £480. To find the price of a cm² of glass we used shape J as it was the easiest. The perimeter of J is 8x£20 which = £160, £200-£160=£40, £160+£40=£200. £40÷4cm²=£10 which is the price of 1cm² of glass.