If 50 books is $86.45 for each Books and 150 books is $80.95 for each book what is the cost for 60 books?
No idea. Maybe there's a price break from $86.45/book to $80.95/book if you buy more than 100 books. In that case, 60 books cost
60*86.45 = $5187.00
There are many different functions that pass through those two points. I assume you are looking for a linear relationship. Assuming that books are never free, let's assume that the price is $86.45 each for up to 50 books, and then decreases linearly the more you buy.
In that case, the price of x books is
p(x) = 86.45 + (80.95-86.45)/(150-50)x
= 86.45 - 0.055x
I fear you have not posted the problem as given to you.
oops. i gave the price per book. So, 60 books would cost
p(60) = 60(86.45 - .055*60) = $4989.00
To find the cost for 60 books, we can use the concept of proportions.
Let's start by finding the cost for 1 book.
For 50 books, the total cost is $86.45, which means the cost for 1 book is $86.45 / 50 = $1.729.
Now, we can calculate the cost for 60 books using the cost for 1 book:
Cost for 60 books = $1.729 * 60 = $103.74
Therefore, the cost for 60 books is $103.74.