Last year the sales at a bookstore were 75% fiction books, and 25% nonfiction books.

the average cost of a fiction book was $15. the average cost of a nonfiction book was $16.

what was the average cost of all fiction and non-fiction books sold at the bookstore last year?

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here