The 3 pounds of beef cost $4 per pound, so the total cost of the beef is 3 * $4 = $12.
Adding the cost of the oil, Mary's mother paid a total of $12 + $1 = $13 for the beef and oil.
Since the total cost of the grocery was $16, Mary and her two friends should pay $16 - $13 = $3 for the chicken.
Since they agreed to evenly split the cost, each of them should pay $3 / 3 people = $1 for the chicken.
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Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Mary and her two friends agreed to evenly pay for the cost of 2 pounds of chicken. Mary's mother went to the grocery and bought the 2-pound chicken, 3 pounds of beef that cost $4 per pound, and a liter of oil that costs $1. If Mary's mother paid a total of $16 for the grocery, how much should Mary and her two friends pay each for the chicken?

### Answer:
