Mary saves for a holiday each year. Roberto is going to go on holiday. He has two coupons that will save him money on his holiday. For Roberto's holiday the cost of the accommodation is $$\(\$ 1600\)$$ the cost of the flights is $$\(\$ 800\)$$ Roberto can only use one of the coupons. He wants to save as much money as he can. (b) Which of the two coupons, A or B, should he use? Show your working clearly. (3)

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