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3*4 is 12 so $5 * 4 is $20. It's like a proportion. So, 12 books would cost $20.

Q: If you buy 3 books for five dollars how much would twelve books cost?

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133 dollars.

9 books cost $20.25 9/9 = 1 book costs $20.25/9 = $2.25

4 dollars

$3.75- $1.25 +$ 1.25 +$1.25 ------------------------- $3.74 three dollars seventy-five

Mark up = 75%implies selling price = 175% of cost 175% = 63 dollars so 100% = 36 dollars.

Related questions

If 5 books cost 100 dollars, then the price of 1 book is 100/5 = 20 dollars. Therefore, the price of 2 books would be 20 * 2 = 40 dollars.

ya

120 dollars

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133 dollars.

1450

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