A friend of mine bought a used pressure cooker for $60. She somehow did not find it useful and so when a friend of hers offered her $70, she sold it to her. However, she felt bad after selling it and decided to buy it back from her friend by offering her $80. After having bought it once again, she felt that she did not really need the cooker. So she sold it at the auction for $90.
How much profit did she make? Did she at all make any profit?
Answer
The woman made a profit of $20. She made $10 (bought at $60, sold at $70) when she sold the item for the first time and another $10 (bought at $80, sold at $90) when she sold it for the second time.