Calculate the marginal cost of an extension that requires the following items:
(i) One set of plans from Jane McKee
(ii) 30 hours of bricklaying
(iii) 10 hours of plastering
(iv) 12 hours of decorating (v) 1,500 bricks @ £0.40 each
(vi) 20 bags of mortar @ £7.00 per bag
(vii) 5 bags of gypsum plaster @ £12.50 per bag
(viii) 15 litres of paint @ £6.00 per litre
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