Mary sell lemonade and she donates $0.10 from every cup she sells to charity the cup of lemonade she sells to charity. the cups of lemonade sell for $0.45 one day she made 17.10 how much money did she give to charity that day?

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Someone me i need with this stuff

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You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?