book Maths Puzzle Numerical Ability

Chelsea sold 2 cars for $6,000 each, making 20% on car#1 & losing 20% on car#2. Did he make money, lose money or break even?

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Can some please help with this problem? Find the quotient of x^5 + 32 divided by x + 2

Thanks for your help. What is the area of an equiangular polygon with four sides equal to 1 and four sides equal to square root of 2? Please show the workings and the solution.
Thanks.