2 simple word problem. Need help! 8th grade math?

1.A book with orignal price of 15 dollars has a 20% discount during the christmas holidays. How much does the book cost in Christmas?
2. A bank gives us an interest of 5% per year on the money we invest. If we invested 5500 dollars at the beginning of 2001, how much money will we have at the end of 2006?

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Tags: Christmas, How Much Money, Math Book