Brain Teasers
Ring Sale
Once a man entered my office asking for help. He wanted to sell a ring and was hoping I could help. He said to me that if I got the ring to be sold at $100, he would give me a reward of $20.
I saw the ring, and I thought that I could get a little more money, so I told him that I will try to sell it at $200 instead. He then told me that If I was able to sell it at that price, He will give me $35 instead as a reward.
I tried to sell the ring, and the best price I could get was $140.
What should my reward be?
I saw the ring, and I thought that I could get a little more money, so I told him that I will try to sell it at $200 instead. He then told me that If I was able to sell it at that price, He will give me $35 instead as a reward.
I tried to sell the ring, and the best price I could get was $140.
What should my reward be?
Hint
The first offer stands as it is. The second one is only a raise in the reward in case of a rise in the sale price.Answer
The original reward was $20.For a $100 rise in the sale price, the reward could pass from $20 to $35, so there was a rise of $15 for the reward. That is, $1.5 per each $10 you obtain in the price. I got $40 above the original price, so I will get 4 * $1.5 = $6 plus the original $20 = $26.
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