A shop sign says, “T-shirts. Three for the price of two. Equivalent to a saving of £5.50 on each T-shirt.”
Using this special offer, what is the cost of three T-shirts?
A. £16.50 B. £22 C. £31 D. £33 E. £49.50
D. £33
Let the full price of a T-shirt be £t. Then the difference between the full price of three T-shirts and the price when you buy three for the price of two is £3t − £2t = £t. Since this is equivalent to a saving of £5.50 on each of the three T-shirts, £t = 3 × £5.50 = £16.50.Using the special offer, the amount you pay for three T-shirts is the full price of two T-shirts, that is, 2 × £16.50 = £33.
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