A store has a sale on books. The price is

jkminzeszjt

jkminzeszjt

Answered question

2022-02-07

A store has a sale on books. The price is $17.55 for one book, $16.70 each for 2 books, $15.85 each for 3 books, and $15 each for 4 books. If this pattern continues, how much per book will it cost to buy 7 books?

Answer & Explanation

Hannah Escobar

Hannah Escobar

Beginner2022-02-08Added 9 answers

Step 1
The price per book forms an AP
Tn:17.5516.7015.8515n:1234
they all differ by -0.85
The cost if 7 books are bought will be T7
T7=a+d(n1)
T7=17.550.85×6
T7=$12.45
ljmolerovae

ljmolerovae

Beginner2022-02-09Added 15 answers

Step 1
Price difference with each additional book purchased is $0.85
(=$17.55$16.70=$16.70$15.85=$1585$15.00)
The formula for price per books seems to be:
p(n)=$17.55(n1)×$0.85
where n is the number of books purchased.
p(7)=$17.556×$0.85=$17.55$5.10=$12.45

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