book Maths Puzzle Numerical Ability

a car stereo system thet regularly sells for $425 is on sale for $318.75. find the discount rate.

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book Other Question

how do you solve the problem 3(x-2y)=-12(x+2y)? Hi! i'm stuck on this problem. Radical and fractional exponents
(3{{{SQRT}}2- 2{{{sqrt}}}3) ^3.

thanks