133 dollars.
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9 books cost $20.25 9/9 = 1 book costs $20.25/9 = $2.25
3*4 is 12 so $5 * 4 is $20. It's like a proportion. So, 12 books would cost $20.
$3.75- $1.25 +$ 1.25 +$1.25 ------------------------- $3.74 three dollars seventy-five
4 dollars
You sell 50 books, the cost of the yearbook is $45 You sell 125 books, the cost of the yearbook is $37.50 How much is the cost per yearbook if you sell 150 books? Usually when you're in the process of determining the cost of books per how many books sold you talk to the publishing company who determine the price of the per units of book. From the information given it would seem that per every 75 books they decrease the the price by $7.50, that means that per every 25 they would decrease the price by $2.50 per book. So at 150 books the price of the book would be $35 per book.