book Maths Puzzle Numerical Ability

Can someone show me how to simplify these 2 problems--please show me the steps

(2x)^2 * (3x^4)

and

(-3x divided by 2y^3)^-2

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book Other Question

Sales reduction force a factory to cut back its output by 20%. By what percent must the reduced sales be increased to allow production to be brought back to normal? If the price of a $15 T-shirt is reduced by 1/3, how much sales tax must be paid on the T-shirt in a state having a 4% sales tax?