exam Maths Puzzle Numerical Ability

A computer is on sale for $1600, which is a 20% discount off the regular price. What is the regular price?

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exam Other Question

Can someone help me on this problem #52, page 562 in the textbook I showe above.
Just in case you don't have the book, here is the problem:

I need to find the constant of va
(3x+0.4)(3x-0.4)
Find the product.