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It depends on what book it is.
20.00. What you mean to say is the book costs 80.00 without sales tax. In which case the book costs 86.60 (with the tax). You should get 13.40 change.
Each text book cost 4 pound and so 12 times 4 = 48 pounds
I suggest you get a good coin book and search for your coin in there.
the pen is $2.50. the book= x+3 the pen= x you add them both together. x+3+x=$8.00 +x -3.00 2x=5.00 x=$2.50