What is the price per kg of brand x coffee if 5 kg were mixed with 2 kg of brand y coffee which costs $10/kg to make 7 kg of krystal's special coffee blend which costs $20/kg?

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?