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A music store offers piano lessons at a discount for customers buying new pianos. The costs for lessons and a one time fee for materials

A music store offers piano lessons at a discount for customers buying new pianos. The costs for lessons and a one time fee for materials are shown in the advertisement. What is the cost of one lesson and the one time fee? 6 lessons for $300 and 12 for $480. The problem shows the lessons are $30 each,I don't know how they got it. The one time fee is $120 please show me how they got it!

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