Jin-Ming’s mail order business sells trampolines. The selling price is £400 for a standard size trampoline, and £550 for a large one. The opening inventory at 1 January 2012 was 6 standard and 5 large trampolines. The cost of the trampolines to Jin-Ming is £260 (standard) and £330 (large). In the year to 31 December 2012 Jin-Ming sold 30 standard and 17 large trampolines. He could have sold more of the large size but the manufacturer stopped making them part-way through the year. Jin-Ming’s purchases for the year totalled £14 880 including the purchase of 12 large trampolines.

a) Draw up Jin-Ming’s trading account for the year ended 31 December 2012.

b) Calculate the gross profit on the sale of large and standard trampolines respectively.