Jack earned twice as much as Mary and Jill earned $8 more than Mary. Who earned the most money? Explain why.

1)Jack earned twice as much as Mary and Jill earned $8 more than Mary. Who earned the most money? Explain why.
2)A tire dealer sells 2 tires for as much as he paid for 3 tires. He paid $240 for a dozen tires. What is the total profit on 12 tires?
(See attachment for other two questions)

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This solution is comprised of a detailed explanation to answer who earned the most money and what is the total profit on 12 tires.