6). You left a 15% tip at a restaurant. You left $3. How much was the bill?

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7). A $100 disk player is discounted 10%, but tax is 10%. How much will the total cost be?

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8). Nate loans Andrew $10. He wants Andrew to pay 20% interest compounded each month. How much will Andrew owe Nate, including interest, after 3 months?