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30 March, 00:47

Perfume is sold in two different sizes of bottle. The 80ml bottle is priced at £55. The 50ml bottle is usually priced at £45, but is on special offer. If you buy one 50ml bottle of perfume you can get a second for half price.

By calculating the price per ml determine which offers the best value for money the 80ml or two 50ml bottles? You must show your working.

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  1. 30 March, 01:52
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    1ml of 80ml bottle: 55/80 = 0.6875 pence

    1ml of 50ml bottle: 45/50 = 0.9 pence

    If no special offer the first bottle is a better value for money.

    Since special offer though, you'd be buying;

    50ml bottle £45 + another 50ml £22.5 = £67.5 in

    which case 1ml would cost;

    67.5/100 = 0.675 pence. Hence buying 2x50ml

    bottle would be a better value.
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