exam Maths Puzzle Numerical Ability

An audio store buys 60 cassettes. It gives away 3 cassettes free for a contest. It sells the remaining cassettes for 2 time the purchase price. The profit on the cassettes is $

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Can you please help me with this. I do not understand how to do this.

Suppose that x has a distibution with u = 72 and o = 8.
if random samples of size n = 16 are selected, ca what is distributive properties and how do you do it?
and also how do you factor expression?