book Maths Puzzle Numerical Ability

A man buys 2 horses. He sells one horse for a 20% profit. He sells the second horse for a -20% profit. What is the difference between his total profit and loss, and how much did he sell each horse for?

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book Other Question

For the function defined by f(x) = 2 2 x − , 0 ≤ x, use a sketch to help
find a formula for f �1(x). If you invest $7,500 in an account paying 8.35% compounded continuously, how much money will be int he account at the end of

(A) 5.5 years?
(B) 12 years?