11+ - 11-Plus Maths - Solving Problems - Money 2 (Difficult) Solution

Q.1.

Which one of the following statements is correct?

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If you buy something for £2.50 and sell it for £17.50, you have sold it for 7,000% more than it cost you to buy
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If you buy something for £2.50 and sell it for £17.50, you have sold it for 700% more than it cost you to buy
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If you buy something for £2.50 and sell it for £17.50, you have sold it for 600% more than it cost you to buy
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If you buy something for £2.50 and sell it for £17.50, you have sold it for 500% more than it cost you to buy

Q.2.

Which one of the following calculations is correct?