The antique dealer
A rather softhearted antique dealer often paid more than she should and sold for less than she could. This time, she was figuring out her costs and profits. Her sister said, ‘You sold that dish for only a 5 percent profit. If you had bought it for 10 percent less than you did pay, and sold it at the same price, you would have made a $15 profit.” How much did the antique dealer pay for the dish?
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Take from the pack the thirteen cards forming the suit of diamonds and arrange them in this order face downwards with the 3 at the top and 5 at the bottom: 3, 8, 7, Ace, Queen, 6, 4, 2, Jack, King, 10, 9, 5. Now play them out in a row on the table in this way. As you...