A website Maths Puzzle Numerical Ability

If s = 2 - 2^

1/3 + 2^2/3, then determine the value of (s^3

- 6s^2 + 18^s + 18).

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A shopkeeper allows 25% discount on the marked price of his articles and hence gains 25% of the Cost Price. What is the marked price of the article on selling which he gains Rs. 120?