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How the assistant sums the figures in following conversation?(to get nine pound)?
Assistant: Two toasted sandwiches, three forty-
five each, coke ninety p, orange juice one pound
forty, that’s nine pounds twenty please.
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2 toasted sandwiches = 2 * 3,45 = 6,9
1 coke = 0,9
1 orange juice = 1,4

add up to a total of = 6,9 + 0,9 + 1,4 = 9,2

BTW, i think you meant "amount to" , not "mount".
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thank you